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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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โˆ™ 2005-02-03 22:43:03
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Q: 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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