Question about 2001 BMW 5 Series

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Emission light comes on

Exhaust emission value deterioration warning light has come on. Does this need to be seen immediately and will the car pass an MOT emissions test with the light on?

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Black insulation tape over the light

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It will not pass the test with the light on, and if u turn off the light they will know when they test it by testing/checking the system readiness function. Go to a Kragen or an Autozone they will run the test to see what trouble code has turned the light on, it is free, post the code back here. Oh have then reset the light after the test.

Posted on Jan 07, 2009

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My Mini Cooper's engine light is coming on saying engine deterioration in exhaust emission values. How can I fix this and will it be expensive? thank you


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Exhaust emission warning light


Hi,
This means that your car has registered a problem with the exhaust emission. This generally means that your car is either running too rich or too lean as a consequence of another problem. This can be caused by a large number of faults from an air leak in the intake system to a hole in the exhaust system or even an oxygen sensor problem.
This particular car is famous for a rubber crankcase breather hose at the back of the block persishing letting in unmetered air. The hose runs from the back of the rocker cover to a small disc shaped diaphragm on the underside of the inlet manifold. This diapragm is also prone to failure and sometimes can be identified by a hissing noise when the engine is switched off.
Failing this, you will have to have the engine management fault codes read to narrow down the problem.
This engine is generally inexpensive to repair due to it's good reliability.

Pete.

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