06 mustang gt with Roush package sport has engine check light on code shows PO 403 Can you explain code?

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PO403 Is rather generic. It simply means that the circuit has failed somehow. This means that the connector on your Exhaust Gas Recircultion sensor could have simple come off. I recommend that you take this to your Ford dealership. They can pin-point the prblem. They have to fix these types of problems for free for a certain amount of time and mileage. It is a government thing. Hope this helps.
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