2003 Chevrolet Impala Q&A
2003 Chevrolet Impala Question: check engine light on
If the exhaust system was replaced from the cat. back it should not have anything to do with the check engine like coming on. Unless there was a O2 sensor in the exhaust pipe that was installed new. If it was left off or not plugged back in then yes this could be your problem. I would take the car to your local auto parts store have them scan the codes for you, It's free. Ask them to reset the codes and make a note of the code numbers, drive the car and see if the light returns before fixing anything. - torque wrench
it's poss you may have warped rotors - Visitor
check engine light comes on if the the coolant is low as well might wanna check that too. - HoboRepairman
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