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Engine management system light stays on but car is driving ok

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  • Anonymous May 18, 2009

    I have the "check engine' light on but can not locate the diagnostic port to check for the problem.



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Probably an oxygen sensor,most often the one before the cat in the manifold but get it checked with a diagnostic computer to be sure

Posted on Oct 24, 2008

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Mr2 reg on a 1990 engine managment light comes on its red seems that when drivers side lower than other side light goes off otherwise stays on

Posted on May 05, 2009


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Posted on Jan 02, 2017

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SOURCE: when car sitting in idle the engine management

Try changing the fuel filter.

Posted on Jun 07, 2009

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SOURCE: engin managment system light keeps coming on and off

The best ideea is to scan your Engine Control Unit with a VAG-COM, Bosch KTS, ... diagnosis tool. If you have one of these dedicated scan tools you will find definitely the engine fault code-"P...." and the clear description of the error. Also you can try to erase this error (or these errors) from the Engine Control Unit memory. If errors are "sporadic" type you certain have permission to erase them, also for some kinds of "static" errors. Because your Engine "MIL" - Malfunction Indicator Lamp keeps coming "ON" and "OFF" you have a big good hand to clean errors from Engine Management System memory. If you don't have any diagnosis tool, you can also try something else. For check up if the engine have a proper turn, you can successively disconnect each spark plug coil from the engine wiring system, engine idle, car stationary. When you operating this you must be free of chassis ground (battery ground)!!! When you disconnect a spark plug coil and the engine speed (rpm) drops, that means this coil works properly. When one coil disconnected and engine speed (rpm) still remain unaltered, this coil (or spark plug) is out of order. First you can change only the spark plug and check up again. If no changes the coil is defective and must be replaced! My recommendation is first to change all spark plugs on the engine, and after that check up coils. Please Rate my Response! Thanks!

Posted on Jun 14, 2009

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