03 chevy cavalier


Asked by Jan 08, 2016 at 10:28 PM about the 2003 Chevrolet Cavalier Base

Question type: Maintenance & Repair

My 03 cavalier check engine light is can't be erased even
though if already fix the problem any suggestions on  what
can be worng

6 Answers


I was reading that the ecm was damaged but I put a new one and the engine light still on


Then there is still a problem, it could be in the wiring, if the ohms readings are off just slightly then it can turn on the light, this is where a live data scanner would be the tool to have, that way you could see exactly what the ECM is reading at any given point in time, then you can repair the systems that are reading incorrectly. HTH


The code is for the ho2 sensor and the sensor is new and I check the wiring and everything is good

1 out of 1 people think this is helpful.

What trouble code do you have? It'll be a P---- number (P0302 for example). If you just fixed it you may have to wait a day or 2 for the computer to run the diagnostics on the system and determine that it's been fixed. HTH. -Jim


Did you ohm out the wiring from the ECM to the O2 sensor itself?


I just did an O2 problem on a S10 that was shorted in the harness, just rewired the O2 circuits. No more problem.

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