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I had my truck inspected (it passed) and the next day the check engine light came on. Why would it do that? How do I reset it?
 

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OBD II Code Reader

If you know someone that has one, borrow it and read it yourself. Once you know the code(s), search the internet for the probable cause. Otherwise, stop by Autozone, they will read it for free and most likely diagnose the cause. Good luck.
 

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kenny just leave it alone. must have opened the gas cap w/engine on during the inspection. it will go off once you start and stop it a few times.
 

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You can also disconnect the battery for a few minutes.If something is wrong it will come back on in about 40-50 miles.Then go to Auto zone or Napa to get code for free and look it up on the internet.
 
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