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Q: Code po28 what is it on 2004 BMW 325xi

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Code Po28 what does it mean
(1) Answer
I think that you mean P0128, which is a common code on BMW. It means that the Engine is not warming up properly, here is an article that I wrote that gives some theory and background on this code.

http://repairpal.com/OBD-II-Code-P0128