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Engine Warning Light


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On my 2004 GS300 while running the A/C and at idle speed, from time time, I get an engine warning light. The warning goes away after a day or so but reappears again under the same conditions. Is there some type of sensor that increases idol rpm's to account for A/C pull on engine while at idle? Thanks for reading and responding.


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It's better to see if there are any stored error codes than speculating. Too many issues can activate the CEL. Many people have reported that stores like Autozone will read the codes for you at little or no charge. If you have one of the more recent Garmin portable GPS units with Bluetooth, Garmin has their compatible "EcoRoute HD" ($100 retail) product that plugs into the ODBC port under your dash and turns a Garmin GPS into a code reader as well as providing lots of other engine performance information.

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