check engine light on for month, now off. does it go off after a time period or did the problem solve itself?
Sometimes certain codes will reset after so many starts (or cycles)l. Nothing in or on a vehicle fixes itself.
Agree,may have been a lose wire on a sensor,or a sensor acting stupid,and if it was acting stupid,,that light will be back on shortly.
Sometimes a bad tank of gas or even a loose gas cap can set it off
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