Q: what do I do if timing belt is off by one tooth on 1999 Acura CL

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is the tensioner the problem
(4) Answers
Take it back to the mechanic who replaced the belt, if it was just previously done. Who told you it was off one tooth? If you havent replaced the timing belt recently, you are at the mercy of the mechanic who told you it was off one tooth. Get a second oppionion from other mechanic you know is honest and reputable.