2005 very Passat, the check engine light was on for about a yr everything ran smoothly now light went off car runs smoothly what is it?
Why are you asking anything if the check engine light is OFF and the car runs fine? You didn’t think to ask someone to check the car for a YEAR with the check engine light on and now you want answers?
Ignore it, like you did the check engine light and get on with your life.
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