Question about 2000 BMW Z3

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Exhaust emission warning light

Yesterday a warning light lit on my Z3 - "exhaust emission values have deteriorated" it says in the handbook. 2 days before I changed the plugs to Denso Iridium IK20 and the car is running better than ever before, no noticeable misfire. Can I still drive the car with the waring light lit? Can you suggest any reasons for it being lit, and does it need to be reset via the OBD11 (ie by a dealer)?
Thanks

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  • roadrunner Jul 16, 2008

    I have the very same problem, the Exhaust emission warning light came on a few days ago, it’s a BMW 5 series and it’s not due a service for a while yet.

    Anyone know what causes this and what the remedy is?

    The car drives fine with the warning light on I will be bringing the car to a garage soon but would like to know what to expect.

  • Anonymous Aug 14, 2008

    My Z3 is doing the same thing, however as i have a rattle under the car, which sounds as though it has something to do with the exhaust. I take it that this has caused my exhaust emmissions light to come on. t he car also seems to be loosing power, especially when i first start it up, it dosen't want to pick up when you put your foot down.



    Dave

  • Vickas Aug 15, 2008

    I am having the same problem on my 5 series. The warning light came on about a month ago and stayed on for about 2 days - I spoke to a mechanic who told me not to worry about it. The light has come on again today. Does anyone know what it could be??



  • Anonymous Sep 02, 2008

    loosing power when accelerating sound like it is not getting any gas

  • Vickas Nov 08, 2008

    See my comments about the air intake pipe

  • Anonymous Mar 15, 2014

    Emission warning light will not clear but car runs fine

  • Anonymous Mar 24, 2014

    Exhaust emission values light is on car has done53000 miles have I got a problem?.. Thanks

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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.

Posted on Aug 19, 2008

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This may be your egr valve, does it want to stall when its ticking over.

Posted on Jan 22, 2009

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I posted a couple a months ago that I was having the 'exhaust emmissions' light coming on my BMW 520i a couple of months ago......... I found a local BMW specialist who initially could not find the fault. While carrying out an inspection 2 last week he found that I had a tear in the air intake pipe. He strongly believes this would cause the light to come on.

I have had it replaced today so will know in due cause whether this is resolved. So far so good..

Posted on Oct 15, 2008

  • Vickas Oct 15, 2008

    Forgot to mention that he had to replace the same part on a Z3 a couple of weeks ago..

  • Vickas Nov 08, 2008

    See my comments below dated the 15th October........ Since I have replaced my air intake pipe I have not had the warning light back on :-) It only cost me £70 to get replaced by a BMW specialist using genuine parts!



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Hi
same problem with my 318ci coupe,few months ago the light showed up for few hours then went off. now few days ago came back on again,stayed for 2 days and now off again. just got the car read on the machine and there are2 faults, it may be the exhuast,so they got to check the exhaust system or it may be the 02orh2 cenre, cant remember what it is called. waiting for quote

Posted on Aug 29, 2008

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Hi Had same sign coming on from my 320i, called 24hr call service on bank holiday weekend and the eng came did the check and found that the ignition coil was faulty and fixed it immediately!! that was brilliant. Hope the prob is fixed..

Posted on May 29, 2010

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