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Bogus Check Engine Light for Knock Sensor 850 1994

Have had the check engine light on for several months... I reset it and it comes back on... I changed the oil on Sunday and the light went out immediately... On startup, the car blew a little puff of smoke and then cleared and has run clean ever since. I'm baffled, but cautiously happy. I do know that I have a few vacuum leaks, and my transmission fluid needs replacing (due this weekend), but it's running..

Very Good Luck to You!

Shawn






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