Either buy an OBDII scan tool and do it yourself or as suggested an auto parts place like AutoZone can do it for free.
An existing problem that hasn't been corrected will store in the ECM memory and the Check Engine light will return, it can also indicate recording an operating trend cycle that is out of ordinary and reset itself. A scan report will only serve as a guide to help the tech diagnose problems and what to check for, not necessarily a bible for telling him which part is defective.
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how can you diagnose a check engine light on a 1995 toyota avalon?
Linear Mode
