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Service engine soon light

(2002 BMW 325i)
in Largo, FL on August 26, 2010
My service engine soon light remains on. I have taken the car to the dealer many times and they have yet to determine why. They clear the fault code and within a day its back on. No driveability issues have been experienced. Been on now for two years. Any suggestions?
Displaying 2 answers & 2 comments
Popular Answer
on August 26, 2010
Find a REAL shop, this is 'dealership' is a joke. BMW is a very logical car, and when it has a code there is a lot of what is called feinlock data points to isolate the code problem. However it takes a good technician to be able to use this data.
Look for a good German Shop or tell me the code(s) .
I work on BMW and they do have some pattern failures. Tell me the codes, and I maybe I can help you online. 2 years and the code still not fixed is a disgrace.
on December 27, 2010
I has 2002 BMW 325i 2002 and I has the same problem with jboracer. I changed 6 brand new coils, spark plugs, 4 O2 sensors, air filter and oil change service but the light still. They clear the fault codes and within a day its back on. I had P1345,P1353,P1085,P0174 and P0171. Please advice what I need to do to fix this problem. My email:
on November 21, 2017
Check the DISA Valve on the side of the air intake.

Sometimes the DISA valve itself needs to be repaired with a repair kit from X8R. The plastic flap parts inside the DISA valve fail, due to flawed design, so the X8R kit replaces it with a new metal parts and comes with a brand new air seal o-ring.

Sometimes it's just the electrical connector on the DISA Valve needs to be cleaned, signs of a bad connection on the connector can be a small unusual vibration while at a stop. The vibration goes away when the DISA Valve connector is cleaned and plugged back in or after servicing the DISA Valve with new components.
on November 21, 2017
Also check the air intake boot, sometimes cracks develop in the rubber over time.
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