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Chevy Silverado
Check Engine Light
Ford Explorer Sport

Why would your Check Engine Light come back on even though you have replaced the O2 sensor and cleared the code?

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2005-02-03 22:43:03
2005-02-03 22:43:03

Pull 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 test the computer runs the car through, 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.

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Have the code read. Autozone will do this for free. Even though the light is not on now. It will be stored as a recent code. It has to cleared to be erased completely. Good luck. i had the same problem with mine it turned out to be the knock sensor i replaced it and the problem went away give that a try

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You need to reset the light by using diagnostic equipment even though the part was replaced the fault code will still be stored in the ECU memory.

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