Service engine light


Asked by Sep 12, 2016 at 08:01 PM about the 2011 BMW 3 Series 328i Coupe

Question type: Maintenance & Repair

I have a 2011 328i...50000 miles...service engine
light came on....and has stayed on for two
days..took to OReillys for test.....nothing showing
on test equipment but light still on? Suggestions?
Recent maintenance included addition of brake
fluid and changed air filter one week ago.

3 Answers


This may be a service reminder letting you know you're due for a maintenance check up. HTH. -Jim


Some engines have knock sensors which can trip the check engine light but throw no code. One cause is a bad spark plug. Check the spark plugs for one that might have buildup on it. If present, clean that plug or replace it. They are supposed to be good for up to 100,000 miles before servicing, but even new parts can fail prematurely. You may even want to replace all the plugs and wires just to have consistent spark at all cylinders.


If the light is on their is a code but a genaric code reader can't read it you need to find a shop with a better scanner it may be a communication error with another module , abs, body controls , trans , or active steering control

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