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Rustynutt 05-08-2009 12:18 PM

Service Engine Soon Light
Howdy All,
I have an 04 330ci with a Service Engine Soon light on at 100k…. I have replaced the fuel pump/filter and all 4 O2 sensors….. The computer keeps giving me an error saying the engine is running to lean… Anyone have any other ideas besides sell/trade it in? LOL

Big Evil 06-15-2009 03:47 PM

You have a restriction in the air intake, or a faulty sensor on the front side of the engine (ECT, Ambient, IAT, etc.) or a vacuum/air leak. It's most likely actually causing a lean condition and the old stuff as well as the new stuff was/is reading right.

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