01 echo oxygen sensor replacement?

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There are two oxygen sensors, the one closer to the engine (before the catalytic converter) is typically the one that goes bad first. This one is also easier to replace. You need a small flathead screwdriver, follow the wires from the sensor to where it plugs into a socket - its a tight space, you will need a flashlight. There is a little plastic tab on the connector piece that you must pry UP with the small screw driver, then you can pull the plug out of the socket. After that, you can use an open end wrench or adjustable wrench to unbolt the old O2 sensor from the exhaust. This can require a lot of force, so a breaker bar may be necessary, I also recommend using penetrating oil. It is highly recommended that you put high temp anti-seize compound on the threads of the new O2 sensor before installing it. Bolt it in and plug it into the socket and you are done. The job is slightly more complicated if you are reusing the old wiring harness - you will need to cut the wires from the old O2 sensor and solder the connector/plug piece onto the leads of the new O2 sensor, make sure you match the length of the original (you don't want a lot of extra slack).

The post catalytic converter O2 sensor is considerably more work, but not that much more difficult. Unfortunately the wires run under the passenger seat to a plug under the center console. You actually have to remove the passenger seat to replace the O2 sensor, but its not that big of a job really. Full instructions can be found here:
(NOTE: This was online but I can't seem to pull it up now so I'm sharing a copy I made, its an excellent tutorial)
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How do you replace the oxygen sensor on a Subaru?

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How do you replace the oxygen sensor in the manifold?

It takes a special socket that sometimes you can rent from the parts stores. Or you can buy them for about $10. Buy a specail socket from an auto parts store for O2 sensor. M

How do you replace an oxygen sensor?

First locate the sensor(s) - there may be multiple O2 sensors on a vehicle. O2 sensors are normally mounted on the exhaust manifold or in the exhaust pipe itself - usually one

How do you replace Rodeo oxygen sensors?

They just screw into the exhaust pipe. There are clips that keep the electrical connectors in place, you will have to pry those out, but it should not be a problem. Then all y

Where are the oxygen sensors located on a 2000 Toyota Echo?

Answer . This answer will first describe the exhaust system of the 2000 Toyota Echo and then attempt to describe where the oxygen sensors are located. The exhaust system

When should you replace your oxygen sensors?

No set intervals . It is only necessary when the computer recognizes a problem with it. You will have a check engine code. Mine triggered a code " low output " for about 6

How do you replace oxygen sensors?

Answer . You unscrew it and take it out. It may require a special slotted socket. Or if there's room, you could break the top off and use a regular socket or box end wrenc

Where is the oxygen sensor and how to replace it?

Sensor is in the exhaust usually near the exhaust manifold. V engines will have at least two and newer cars may have more than two. Once you get to the sensor replacement is u

How do you Replace Oxygen sensors on 2001 Toyota Echo?

Get under the car, follow the exhaust line until you see the O2 sensor (toward the front of the car), unplug the plastic snap in connector by inserting a tiny flat head screwd

How do you replace the O2 sensor on a 2003 Toyota Echo?

There are two of them, one before the cat, and one after. Normally the one that needs replaced is the one BEFORE the cat (closer to the engine). You should unplug it first, us
In Toyota Echo

How much the oxygene sensors cost for Toyota Echo 2004?

You can find generic ones for as little as $15-$30 on ebay, but you will have to splice or solder the wires to the existing harness. OEM direct fit replacements can be found f
In Oxygen Sensors

Do you have to replace the oxygen sensor?

I have a 1998 Malibu and in my experience, YES you want to replace the Oxygen sensor when it starts giving problems. The car will sputter especially when going up a steep incl