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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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I reset engine management light and within minutes light comes on

If the check engine light or MIL - malfunction indicator light , or service engine soon light is on , it means there is a problem with the engine management system ! an it means it set a DTC - diagnostic trouble code in the PCM / ECM - electronic control module ! You can try resetting all you like but it's not going to stay out ! You need to have the vehicle scanned for codes an fix it ! Check Engine Code Scanner Advance Auto Parts

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First, it is normal for the check engine light to come on momentarily when you turn on the ignition switch and then go out. If it stays on, then you have a stored code that indicates a malfunction of some kind in your engine or transmission control systems.

* The Check Engine Light comes on and stays on.
If the Check Engine Light illuminates constantly during driving with no noticeable driving or performance problems, there is a permanent fault in the emission control system. When this happens, the computer that controls the emission system usually has a backup program that runs while the fault is present. (These backup programs are often referred to as "limp home" mode programs.) You should get the vehicle serviced as soon as possible, but in most cases, the vehicle will continue to operate, though you run a risk of it dying or not starting.

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This means that a vital component of your emission control and engine management system has a serious problem. It usually involves a component or system needed for the vehicle to run at all. In most cases, drive the vehicle as little as possible. In many cases, the vehicle is not safe to drive at all -it could stop or stall out at any moment. It is best to pull over to a safe place and have the vehicle towed to an automotive diagnostician for a thorough inspection and repair.

I suggest visit some Autozone or AutoShop with OBD Scanner Reader in order to scanning the module to know exactly wat fault code is stored there; note this code number for additional details.

Hope this guide helps.

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Check engine light comes on when downshifting on a hill; then shuts off when I back off

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1 Answer

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EMS stands for "Engine Management System. Please read on.
Lots of areas are monitored by the engine management system, some of them are not apparent to anyone just driving the car, and usually they are not immediately terminal (which is why the light is yellow and not red). However they can get worse and should be checked as soon as possible. The following tells you a bit about engine management systems and how to read codes/ reset them.

The 'Engine Management Light' come on if the automatic monitoring system detects a malfunction in (usually) the powertrain components of the vehicle. If the fault has been fixed, then what you need to do to put the light out is:-

1 Disconnect the battery.
2 Reconnect the battery - this resets the engine management to its base configuration.At this stage, if you start the car up the Light will still be on and will stay on until the monitoring system has completed a series of tests some of which depend upon the car being operated under various normal driving conditions. Typically this will take about 20 minutes of normal driving. If all the tests are within spec then the light will go out and you will be back on the road!

If the fault persists then you have a specific problem. You will either need to take it to a dealer who will be able to read the codes and fix the problem (lots of dosh outlay I suspect). If you are reasonably confident you could buy a code reader to find out the problem for yourself. Gendan are currently selling theirs for £39.95 free pp which covers all post 2001 petrol and post 2004 diesel cars. Note if you reset using a code reader you still have to go through the 20 minute drive process before you are "back in business".

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