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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.

On some vehicles, (including 88-> Ford products) the 'Check Engine' light is timed to come on at around 60k miles, even if there are no problems. It's part of a maintenance scheduling system. There is often a microswitch which will allow the light to be reset, but the placement and operation of that switch varies by vehicle make and model. A technician at a smog inspection station tried to set me up for a $500 triple oxygen sensor replacement job because of that light.

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βˆ™ 2015-07-15 21:13:18
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Q: How do you make the check engine light go away?
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