00 impala is getting bad gas mileage could it be thermostat or o2 sensors check engine does not light up?
are there any other symptoms? have you ever had a tune up done?(plugs, wires) oil,air,fuel filters been changed? check or do some of the above to see if this helps.
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Check engine light diagnostic test indicates bank 2 O2 sensor is slow to respond where is this sensor located?
just a quick note: bank 2 is LEFT side (drivers) on a rear wheeldrive vehicle ,on front wheel drive vehicles it would be the frontside when looking down from the front of the vehicle ,Sensor 2 isafter the cat converter! if you replace that sensor, clear thecodes or have someone clear them for you an…d you should be all set Chris (technician for 20 years !!!!!) Hey James==It would help if you stated what kind of car you have.Joe the 2 of bank 2 is the 2nd oxygen sensor that is located after thecatalytic converter.usually closer to the tailend of the headerpipe. The sensor I believe you are looking for is in the exhaust pipe orexhaust manifold, usually the right bank which is on the right sideof the car (driver is left), or close to the firewall if engine ismounted sideways. Some cars are equipped with a sensor behind thecatalytic converter that tells the computer the HEALTH of theconverter only. It has nothing to do with running of the engine persay. (Mechanic for 35 years) Bank 1 is which ever side has cylinder 1. It could be left orright. Bank 2 would be the other side. Bank 1 sensor 1 would bebefore the catalytic converter. Bank 1 sensor 2 would be after theconverter. The same applies with bank 2. (mechanic for 12 years) (MORE)
Could getting bad gas when you fill up cause the check engine light to come on and cause you to lose acceleration?
Yes. Go to auto zone and have the codes read for free. And change the fuel filter.
How do you reset the 'Check Engine' light after replacing the O2 sensor on a 97 Mercury Mountaineer?
Easiest way is to disconnect the battery cable (negative) for a couple of minutes, then reconnect. This clears the computer. If everything is OK, Check Engine will stay off.
If a 98 Honda Civic EX check engine light is on and it is getting very poor gas mileage and stalls frequently what could it be?
Answer . Your problem is most likely a faulty oxygen sensor. Have it serviced. . My car did this last summer, if it is shuddering too, it could be your cylinders. have the wires and plugs changed. it's cheap and could be the source of your problem.. I had this problem for about a year and a ha…lf, it would only act up sometimes. Finally it got to where it didn't want to go at all, and we ended up replacing the distributor, the plugs and wires and she's good as new! (MORE)
Answer, O2 sensors and gas mileage . \nIt is a very broad answer for why your engine light is on. He is probably right that is on due to the oxygen sensor but as for the gas mileage statement. If you haven't changed your pcv valve, that can kill your mileage as well, but it won't cause your eng…ine light to come on. If you are experiencing hesistation in your acceleration, it may be a bad mass air flow sensor and that will cause your engine light to come on and kill gas mileage. I personally have run my vehicle with a bad 02 sensor and passed my state emissions test. So kudos to me. But I also use Slick 50 High Mileage Fuel System Cleaner. This stuff made the engine light go off after a full tank of gas with it mixed in. It cleaned the intake manifolds well enough to deactivate the check engine light. So if you want to put off a potentially couple hundred dollar repair, try the product first. I recommend anyone with an oxygen sensor engine light try this before replacement. It works. I have used it first had on my 2002 Dodge Dakota 4.7L V8. Good Luck, oh, it costs about 8-10 bucks for that slick 50 stuff, worth it though. (MORE)
Could it be a bad oxygen sensor after the car warms up causing a problem that a 1993 Tempo rattles shakes and check engine light comes on but does not do on short trips around block?
NO.your car would bog out on you if it was the oxygen sensor. Its got to be a wireing prolem for that engine light to come on or its something else making it turn on. Get your suspention checked out.
Answer . \nYou have a choice. You can guess at replacing one of the Oxygen sensors. (I think they are pricy) Or take it to a garage that specializes in this field to determine what is really wrong. A code for an O2 is not necessarily the O2 at fault.
Car hesitates check engine light stays steady or blinks when giving gas had a tune up done and replaced bad gas any other ideas of what this could be what's a v-tech sensor?
\n. \n Answer \n. \n. \nBAD FUeL FILTER.\n. \nBAD THROTTLE POSITION SENSOR.\n. \nBAD MAP SENSOR.\n. \nLOOK, GO TO ANY OF YOUR AUTO REPAIR STORES LIKE AUTO ZONE AND HAVE THEM HOOK UP A DIAGNOSTIC READER TO YOUR COMPUTER SYSTEM , NO COST TO YOU, AND SEE WHAT IT READS OUT.\n. \nYOU CAN BUY …ONE OF YOUR OWN FOR UNDER 40.00\nHANDY THING TO HAVE AROUND FOR ANY CAR YOU PLAN ON KEEPING.\n. \nGOOD LUCK.\n. \n my2 cents \nPull the codes from the computer, match the code to the troubleshooting procedure, follow the procedure to find the source. Repair the source, light will go out if that was the only problem. There are "monitors" or self tests the computer runs the car through a drive cycle, if a problem occurs, it may not run all of the self tests until that problem is taken care. Therefore, another problem may exist. It is emission related. OR hook up a scanner that is capable of clearing codes, and hope that none are still active.\n. \nThe " check engine light" is by far one of the most misunderstood technological advances It is a warning light that is illuminated when there is a problem affecting the EMISSIONS of the vehicle.. Don't let it bother you as it is a good thing once you understand it. One point that was brought up a recent meeting of technicians was that the amount of hydrocarbons is greater when the gas cap is left off than when the engine is running. Hydrocarbons are part of pollution emitted as gasoline evaporates. Going a step farther, one facet of the emission system is the "Evaporative" portion. This is when the fumes from the gasoline are leaking from the system into the outside air. This is one part of the emission system that can trigger a check engine light. I would say a small percentage of the vehicles that have a check engine light are the result of a loose or inadequate gas cap. But understand that many scenarios are possible with the "check engine light" The vehicle's powertrain computer (note that some vehicles have multiple computers aside from the powertain computer) will run a series of self-tests. They will only run under certain criteria. And they are different from manufacturer to manufacturer. Some self-tests or monitors are not run until preceding ones have run successfully. So if there is a problem in one particular area that is preventing another self test from running, you can have a situation where one problem is fixed, but another still exists. If you fix a problem and drive the car through a drive cycle that sets the monitor (or self test) the light will go off as it passes that criteria that triggered it in the first place. \nThere are many different sources for the light to come on. Anything that caused combustion to fail, commonly called a misfire will set the light. Various sensors such as oxygen sensors that evaluate the exhaust before and after the gases are burned in the converter. Transmission codes may set the check engine light to appear. If the car is running okay, get it fixed in a reasonable amount of time such as within the month. It will probably save you fuel if you do. However if the Check engine light is flashing, you should not be driving it as damage is being done to the converter. Some emission components are covered beyond the standard warranty. The converter for example is covered up to 80,000 miles by the manufacturer.\nAfter 1996, the auto industry went to a idea called OBD II (on board diagnostics). This was to get all the manufacturers onto a similar plane for troubleshooting and powertrain control. While they still differ, many corrections and adaptations were made for technicians to better fix the check engine light problems. Prior to this there were so many different and poor troubleshooting data from a check engine light problem that resolving the problem was much more difficult. Many early warning light of this nature were set to illuminate based on mileage. An Oxygen sensor was one of the things that were meant to be replaced when that mileage was hit. This is much like many current "Change oil lights that are set based on a pre-set mileage. \nTo start testing for the check engine light, youll need to find the codes from the computer, match the code to the troubleshooting procedure, follow the procedure to find the source. Repair the source, light will go out if that was the only problem. There are "monitors" or self tests the computer runs the car through a drive cycle, if a problem occurs, it may not run all of the self tests until that problem is taken care. There are self-tests for the oxygen sensor circuit, egr system, evaporative system to name a few. Therefore, another problem may exist. It is emission related. \n. \nOR hook up a scanner that is capable of clearing codes, and hope that it wont come back on. But dont bet on it. Lastly, disconnecting the battery in some cars will clear the memory of the computer and may temporarily turn the light off. Beware that this may also cause other problems such as the car not rembering its idle and will have to relearn it, the radio may be rendered inoperative or in the case of the new Toyotas, the air bag can blow. BCLear. (MORE)
Answer . \nThey are screwed into the exaust system at various points. Some people say that there are 4 oxygen sensors, but technically,\nthat is not correct. Only the front 2 are considered oxygen sensors. They are screwed into the exaust pipe, one on each bank,\nafter the exaust manifold, but b…efore the catalytic converter. Sometimes they are screwed directly into the exaust manfold \nitself. The other 2 are actually called catalyst moniters. They are oxygen sensors, but they serve a different purpose. \nThey moniter the activities of the catalytic converters, thus the name, catalyst moniters. They are screwed into the exaust\none on each bank,after, or downstream, of the catalytic converters.\n. \nAny of those sensors, the wiring to them, or anything that confuses the sensors, like a vacuum leak, or engine misfire, can make the CEL come on. (MORE)
If the check engine light on a 1991 crx is coming on but you just changed the o2 sensor what else could be the problem?
Answer . I just recently had my Check Engine Light come on in my `91 CRX, so I have stared to find what I need to look into. And the manual seems to say that the light may come on for: (keep in mind this for many modles from `88-`91, So they may not be in the `91 CRX). Oxygen SensorManifold Abs…olute Presssure SensorTDC/Crank SensorCoolent Temperature SensorThrottle Angle SensorIntake Air Temperature SensorAtmospheric Pressure SensorIgnition Output SignalVehicle Speed SensorLock-Up Control Solenoid ValveFuel InjectorEGR Control System (Cal. A/T only) If you pull down the passenger-side floor mat from the top, you'll expose the computer. In the middle of it's housing there's a sight window. Turn on the ignition key and a light will blink indicating the code(s) set. Just count the blinks for the first digit, followed by an obvious delay; then count digits again. If more that one code is set, there will be a yet longer delay between each code. This will repeat itself continuously, so you'll have plenty of time to figure it out. Then you have to get a list of the codes somewhere. (MORE)
If a 2001 Chevy Impala LS check engine light is on and the diagnostic says low emissions but you replaced both O2 sensors and the air filter what else could be wrong?
Answer . \nhave vehicle serviced and catalytic converter checked, also have dealer check for service recall on vehicle.
Check engine light on your 1996 Camry was on took it to AutoZone it had a bad o2 sensor replace it reset the light and 2 days later the light is back went back to AutoZone and the code was o2 sensor?
O2 sensor . 1996 was the switch over year from OBDI to OBDII so look for a second O2 sensor after the catalytic converter.
I ran a diagnostic check on my 1998 Chevrolet Blazer and it said that the o2 sensors were bad so i changed all 3 then reset the codes my service engine soon light came back on what could be the proble?
Answer . Did you run another diag test? Are you certain that you used the correct O2 sensors? Did any of them get bent or damaged during installation?
What would cause the check engine soon light and the traction off light to come on the O2 sensors were replaced but the lights are still on Help?
This could possibly be your speed sensor, it is on mine. My ABS light is also on. The only problem is that my speed sensor is part of my hub assembly.
Yes, a bad 02 sensor can cause the cheek engine light to turn on. . It happened to my Honda Accord 96. Autozone OBD states that I have a "Malfunction Oxygen Sensor". I disconnected the negative battery cable and the check engine light went off. Until now it did not came back. It is more than a mon…th now. I save a lot of money.. I heard an Auto Zone commercial yesterday saying that if "your check engine light comes on in your car, then come to Auto Zone and buy a new oxygen sensor" and that would fix the problem. I went TO 2 Auto Zones today and they both checked my check engine light. both said that my O2 sensors are lean or bad. I further discovered that just replacing the sensors which by the way for 2000 Ford Windstar LX 9 parts are about (129.00) with labor about $250.00 is not a guarantee that the check engine light will go out. However if you do go to Auto Zone be sure to ask them for the codes and what they mean. The best thing you can do is take your care to a certified garage and have them to do a computerized diagnostic, in most cases it will cost you between $70.00-100.00, I will save you a great deal of heart ache $$$ later. There are approximately 900 items that can cause your check engine light to come on. Also, someone suggested disconnecting the battery for a minimum of 6 hours, reconnecting it and driving the Van 250 miles and see if the light goes out. will let you know how that works out. Answer See "Related Questions" below for more... (MORE)
What could cause the check engine light error code for o2 sensors to come back on with same code after all 4 sensors were replaced in my expedition?
Vacuum leak I had this exact thing happen on my 98 Expedition Eddie Bauer. After changing all 4 of my o2 sensors the check engine light came back on. So I performed a complete tuneup while performing the tuneup I fould the vacuum line had been pulled from the PCV valve. I believe the shop my wife t…ook it to last pulled it off for a repeat visit. I made sure both ends of the vacuum line were connected well after changing the PCV valve. I removed the codes and drove a couple hundred miles without the check engine light coming back on. In short, you probably have a vacuum leak or are needing to tune the engine. Both are easily accomplished. I concur. Had the exact same problem with my 98 Expedition Eddie Bauer. Thankfully, I have an honest mechanic. Vacuum line was the culprit. Diagnostic codes indicated that all four O2 sensors needed replacing. Once 12 dollar part replaced, all codes cleared up and truck has run like a charm since. ------------------------------------------------------------------------------------------------ scanned codes don't necessarily give you the answer to the problem, just lead you to the answer. When the o2 sensor code came up, the sensor(s) should be then checked, not just replaced. Also I would think the probability of all 4 o2 sensors going bad at the same time would be approaching zero. (MORE)
Answer . That could be one of many possibilites. To know exactly get anOBDII code reader which will run about $150. That will give you theexact code and somewhere to start. If you get a PO440 which is anemissions leak the cheapest place to start is replacing the gascap. And buy a dealer cap not an …after market as they are notalways vented properly. my $.02 . The " check engine light" is by far one of the mostmisunderstood technological advances It is a warning light that isilluminated when there is a problem affecting the EMISSIONS of thevehicle.. Don't let it bother you as it is a good thing once youunderstand it. One point that was brought up a recent meeting oftechnicians was that the amount of hydrocarbons is greater when thegas cap is left off than when the engine is running. Hydrocarbonsare part of pollution emitted as gasoline evaporates. Going a stepfarther, one facet of the emission system is the "Evaporative"portion. This is when the fumes from the gasoline are leaking fromthe system into the outside air. This is one part of the emissionsystem that can trigger a check engine light. I would say a smallpercentage of the vehicles that have a check engine light are theresult of a loose or inadequate gas cap. But understand that manyscenarios are possible with the "check engine light" The vehicle'spowertrain computer (note that some vehicles have multiplecomputers aside from the powertain computer) will run a series ofself-tests. They will only run under certain criteria. And they aredifferent from manufacturer to manufacturer. Some self-tests orï¿½monitorsï¿½ are not run until preceding ones have run successfully.So if there is a problem in one particular area that is preventinganother self test from running, you can have a situation where oneproblem is fixed, but another still exists. If you fix a problemand drive the car through a drive cycle that sets the monitor (orself test) the light will go off as it passes that criteria thattriggered it in the first place. There are many different sourcesfor the light to come on. Anything that caused combustion to fail,commonly called a misfire will set the light. Various sensors suchas oxygen sensors that evaluate the exhaust before and after thegases are burned in the converter. Transmission codes may set thecheck engine light to appear. If the car is running okay, get itfixed in a reasonable amount of time such as within the month. Itwill probably save you fuel if you do. However if the Check enginelight is flashing, you should be driving it as damage is being doneto the converter. Some emission components are covered beyond thestandard warranty. The converter for example is covered up to80,000 miles by the manufacturer. After 1996, the auto industrywent to a idea called OBD II (on board diagnostics). This was toget all the manufacturers onto a similar plane for troubleshootingand powertrain control. While they still differ, many correctionsand adaptations were made for technicians to better fix the checkengine light problems. Prior to this there were so many differentand poor troubleshooting data from a check engine light problemthat resolving the problem was much more difficult. Many earlywarning light of this nature were set to illuminate based onmileage. An Oxygen sensor was one of the things that were meant tobe replaced when that mileage was hit. This is much like manycurrent "Change oil lightsï¿½ that are set based on a pre-setmileage. To start testing for the check engine light, youï¿½ll needto find the codes from the computer, match the code to thetroubleshooting procedure, follow the procedure to find the source.Repair the source, light will go out if that was the only problem.There are "monitors" or self tests the computer runs the carthrough a drive cycle, if a problem occurs, it may not run all ofthe self tests until that problem is taken care. There areself-tests for the oxygen sensor circuit, egr system, evaporativesystem to name a few. Therefore, another problem may exist. It isemission related. . OR hook up a scanner that is capable of clearing codes, and hopethat it wonï¿½t come back on. But donï¿½t bet on it. Lastly,disconnecting the battery in some cars will clear the memory of thecomputer and may temporarily turn the light off. Beware that thismay also cause other problems such as the car not rembering itï¿½sidle and will have to relearn it, the radio may be renderedinoperative or in the case of the new Toyotas, the air bag canblow. Answer: There is no need to buy a scanner, some popular auto parts storeswill scan your car for free. Autozone or Advance Auto Parts do so.Once the problem is corrected the code/check engine light will goout. (MORE)
98 explorer check engine light lit wOBD codes 171 174 that say the airfuel ratio is too far out of spec for the control module to correct it. Could this simply be an O2 sensor gone bad or what?
Yes and no. I have a 99 explorer xlt, I found my thermostat stuck open which would not allow engine to come to operating temp. The o2 sensors only work properly if engine is at operating temp.It also could be the ECT sensor(engine coolant temp).I suggest changing thermostat first then clear code and… drive 50-60 miles then retest. (MORE)
2000 durango we replaced the pcv and your gas mileage has dropped What could be the cause Could it be the o2 sensors Also after the engine warms up it idles rough Any ideas what could cause that?
Check out this link, this happened to mine Dodge Durango Maintenance and Repair - CarSpace Automotive Forums
O2 sensor has caused check engine light to come on - where is this sensor on the 2004 Escape XLT V-6?
If it is the same as an 01 Escape... . I am going through the same thing with my 01 Escape. Come to find out the 01 actually has 3 catalytic converters and 4 (yes I said 4) O2 sensors. It has one before and after 2 of the cats. When I went to Advance Auto they did a OBD II reading from inside my …car and said it is Bank 1, Number 2, when I asked which one does that mean - he just said it was on the "left" side. My husband and I looked and found all four but it was more front and back than left and right. We ended up having to go to the Ford Dealership because while under the car we saw the oil filter was leaking from when I had my oil changed a week before. The tech at the Ford place showed us which O2 sensor it was. It was the last one closest to the right wheel well.. Don't know if this will help you, but maybe it will get things rolling. (By the way we did buy an auto repair manual at Advance for our car which was very informative and showed pictures of every O2 sensor and it's location - well worth the $30 spent!!. Angie Prevette (MORE)
Why does the check engine light still come on even after you changed the O2 sensor and reset the check engine light on a 1996 Lexus ES300?
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
2003 passat w 41k on it check engine light just came on exhaustgas smell when car starts and you've been getting horrible gas mileage?
Try driving it in revrerse for a good 12 minutes, it will back the gas milage back down to under 41k and the problem will dissappear.
A bad battery will not turn on a check engine light. A bad alternator however will. Have your vehicle checked and see if the alternator is putting out at least 13.5 volts and if so there may be another issue causing the light .
Answer . A bad O2 sensor could cause the engine to overcompensate for what it believes to be a problem. It will tell the engine to let in more or less O2 and could damage the engine in the long run. The sensor is not too expensive to replace and could save you LOTS of money in the future.
Replace converter and o2 sensors check engine light came on after 4 days what next to check for code po 420?
Monitor B1 S2 with scanner that does live data with graphs. Graphfor B1 S2 should be almost flat line at .5 volt or more with enginerunning at 2500 rpm for 10 minutes. If not check for vacuum leaks,exhaust leaks. Year, make, model and engine info would be helpful.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
You can drive the vehicle. Do not disconnect the battery as this will remove all codes. The problem could be a faulty catalytic converter and the O2 sensor is picking up bad emissions. However, I had that happen and it was the sensor itself that was bad. It could be a loose wire or bad connection du…e to contaminants. If the Check Engine light is flashing a code that indicates a concern with the O2 sensor, then you'll need to check both the upstream and downstream sensor. The upstream/downstream means before/after the catalytic converter. One common cause is that the connector is loose or needs to be reinstalled to get a better connection. Dirt, moisture, or oil could possibly block the wires from receiving a signal from the o2 sensor. To determine which sensor is a problem, go the your local Auto Zone store and ask them if you can borrow their computer code reader. They will ask you for your driver's license while you use it in their parking lot. The connector on the reader is plugged into the socket under your dashboard under the steering column. Often the socket can be seen by opening the driver's door and looking under the dash/steering column while kneeling on one knee outside the car door opening. Plug in the reader, sit in the drivers seat, and the code reader will tell you what buttons to push. It's easy and if you make a mistake the reader will tell you what to do and set you on the right path for success. After 3 or 4 steps, the reader will indicate whether it's the O2 sensor #1 or #2. #1 is the sensor located in the exhaust manifold, usually accessible via the engine compartment. Try to unplug/plug the wire connector to the sensor out/back in and run the test again. The #2 sensor is accessible from under the vehicle approximately in the area of the driver's door under the car in the center on the exhaust after the catalytic converter. To run the test again you may have to turn the ignition off/on as instructed by the code reader. If all else fails, take it to a TEST-ONLY smog station. (MORE)
this could be caused by, dragging brakes low tire pressure, dirty fuel filter dirty air filter wrong viscosity oil and last but not least A HEAVY FOOT ON THE GAS PEDAL Bad coolant Temp sensor
Bad gas mileage can sometimes be attributed to a vehicle in need ofa tune-up. Have your car serviced and see if that improves the gasmileage.
I have a 2002 Chevrolet Impala 3.8L that has a Check Engine light ON I had it checked at a parts house. They said it was a coolant problem either the thermostat or sensor. What could it be?
A parts house is in the business of selling parts. Ask them if they are willing to take the part back if it does not fix it. The answer is no. Save your money on guessing and have a repair shop do a diagnostic test to determine what is wrong. You will be money ahead in the long run..
I don't know the answer you need but, my 99 toyo tacoma has eng. light on and the code reads po141...heat sensor unit....I am mechanicly inept...if you get an answer,I think I will too !
1999 silverado with check engine light on and vibrating very bad when driving as if there is not enough gas getting to the engine can anyone help?
You don't say what engine you have, but I have a '99 Silverado with a 4.3L V6. Same problem and it was the fuel pump. The engine has a "throttle body" Electronic Fuel Injection. I think there may also be a problem with the EGR Valve, which can also cause a vacuum problem. Good luck. This is the s…econd fuel pump in 18 months. (MORE)
Does any one know which sensor needs to be replace on a 1995 Buick Le Sabre my check engine light is on and it run rough at times and its getting bad gas mileage?
it sounds like the oxygen sensor is bad or the throttle positioning sensor or even the mass air flow sensor. take the vehicle to an auto zone parts store or a checker store and they will read the code for free and you will know for sure. most likely it is the o2 sensor
I changed erg valve o2 sensor and gas cap but lights back on what do I do
Check engine code on1997 ford f150 reads 455 replaced gas cap and vacuum lines but light still comes on after resetting is there a sensor that could be bad and where is it located or something else?
I went to an Auto Shop and was charged $85 dollars to replace the gas cap. I drove to ford and bought a new one.... NOT IT! I went to the ford dealer and they said ...."It must be the valve in the vapor management valve" and they could replace it for $500.
A bad O2 sensor can affect gas mileage. It is an emissions sensor,so when it goes bad, it does not reflect emissions performance onthe car, which could cost a lot in gasoline.
Where are the O2 Sensors located on a 1999 Ford Explorer and which one of these sensors make the check engine light come on front or back?
If over say about 100k mikes just replace all 4 of them. They gave you 100k so do your car a favor. There are 2 on each side just before, and 2 just after the 4 catalytic converters. Be careful not to wire them in wrong. The new Bosch sensors will have different length connectors depending on which …side they are made for. (MORE)
Code PO102 is referring to the mass air flow sensor. The maf sensor tells the computer how much air is being taken ino the engine so it will know how much fuel is required. You need to check for any vacuum leaks or loose clamps on the air intake hose.
Just unplug the negative terminal of the battery for about 10 minutes and that will reset the computer
Many vehicles will trigger a check engine code if the engine never reaches its designated operating temperature (Such as if a thermostat was stuck open). However, there are hundreds of other reasons a check engine light can come on. Putting in a thermostat solely because the check engine light came …on is a very bad idea. Any time that light comes on you should have the vehicle scanned by a trained proffessional (The guy at Napa doesn't count). A good service technician can use the information given by the engine computer to determine what is wrong with the vehicle. (MORE)
could be a number of things like mass air sensor, cam position sensor, O2 sensor if you have a diagnostic tester plug her in and it will read codes and then erase them and if something comesback theres ur problem or take it in 2 ur dealership if u have extended warrenty. hope this helps
\nYes, it is possible as you may have a miss. That miss would turn on the check engine light.
It very well can lower MPG depending on what is wrong. It can also destroy the O2 sensor or the catalytic converter especially if the engine is running rich. Have the ECU scanned to see what is being effected by the problem.
Check engine light keeps coming on in 98 VW Jetta O2 sensor reading replaced 02 sensor still coming on what to do?
You need to have the ECU scanned with an OBD2 scanner and retrieve the code that has been set. The code will tell you what part of the emissions system is being effected. This will help you diagnose the problem. Or you can keep spending money throwing parts at the problem until you may or may not fi…nd the faulty part. (MORE)
What are the codes The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger t…he light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area. (MORE)
OOH its not just O2 sensor every thing around the engine can cause that light to stay on ( vac sys, elec sys. ign sys, belts,cooling sys,ets.) you need to check your engine with OBD2 computer this is found in alot of service shops and it does not coast alot but you buy apiece of mind . let me know
Most O2 sensor problems should set a check engine warning; otherwise, the manufacturer would probably be in violation of EPA and CARB regulations. In older cars, with less sensitive on-board diagnostic (OBD) systems, and unheated O2 Sensors, it may be possible for an O2 sensor to become partially c…ontaminated, and not set the check engine light. In this case, your fuel economy would be degraded slightly, but the vehicle might still meet emissions. Hence, there would be No check engine light. Aside from the slightly degraded fuel economy, the car would still run normally. (MORE)
It could. The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light t…o come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area. It could. The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area. (MORE)
The oxygen sensor is one of many things that could turn the check engine light on. The oxygen sensor is one of many things that could turn the check engine light on.
Yes on most 1996 and later vehicles, the computer will set a code if the engine is running at too cold a temp.