Question about 2000 BMW Z3
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)?
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.
Posted on Aug 19, 2008
This may be your egr valve, does it want to stall when its ticking over.
Posted on Jan 22, 2009
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
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
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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