My car was put on the machine and we fix the problem and now we can't get the check engine light to go off do you have to put in the code and hit the erase button for the check engine light to go off?

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Profile picture for user MercedesMedic

Drive the car for a couple of days. It needs a few drive cycles for the light to reset on its own.

If the light doesn't reset that means the problem wasn't fixed or there is a new problem. At that point you need to read the codes with an OBD2 scanner.

Profile picture for user teniel33

Thanks alot. What if the problem has been fixed and the obd2 keeps saying the same code? We replaced spark plugs Coral crankshaft sensor. It's running a little better but check engine light is still on. Sooo now I'm trying to get the obd2 to erase the code and hopefully that will work. Thanks again

Profile picture for user MercedesMedic

Sure you can try erasing the code with an OBD2 scanner but if the problem is still there the code will come up again.

Do you remeber what the codes were?

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