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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. We just found out that the check engine light on our 1993 Toyota Pickup is due to a bad "knock sensor".

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โˆ™ 2008-03-18 23:47:23
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Q: What causes the check engine light to come on in a 1994 Toyota pickup?
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