Re: Check Engine Light - Automatic for oil change?
A CEL is not a reminder that service is due. Most often, CELs are caused by improperly tightened gas caps.
To help determine what the issue is, we need to know the code. Can you go to a shop (auto supply store) to have it read or see if a local friend has a code reader? Otherwise, you may have to visit the dealer.
I've had the CEL come on at the exact time I was doing something too, just a coincidence that it came on when you were pressing the defrost button.
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