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Sources of owners manual are Dealer, Salvage Yard, Ebay, and many on-line sites. Check Engine light will come on when the computer has detected a fault in the emissions system. Scanning the computer will list a fault code that will help to narrow down the problem. EST is, Electronic Spark Timing. I have a 97' Chevy Cavalier, and my check engine light comes on every once and a while. When it does come on the ETS OFF light also comes on...did you mean the ETS OFF light? or the EST OFF light? ETS OFF means the Enhanced Traction System. I took my car to Autozone and had them read the computer and it had something to do with a misfiring sparkplug, I replaced the sparkplugs and now everything is fine.

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βˆ™ 2006-03-06 15:49:25
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Q: No owners manual for a 97 Chevy cavalier- what does check engine - EST off light mean?
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