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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 08-29-2008, 06:07 PM   #1 (permalink)
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Have a "Service Engine Soon" light... here's the code...

My service engine soon light has come on before and then a day later went off. NOW, it has been on for 2 weeks and has not went off.
I went to Autozone to have them read it and it came back with:

Code PO172
Fuel trim bank one condition

Autozone said more than likely its a bad oxygen sensor.
Any idea's for sure what it could be??
The closest dealer is 100 miles away so if I could fix it by installing a new O2 sensor it would be easier for me....

Thanks in advance!
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Old 08-30-2008, 10:09 AM   #2 (permalink)
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what year and model please...?

02 sensor is a possible source of the prob. Unfortunately, tere are several other parts in your fuel system that can throw the same code.
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Old 09-02-2008, 03:13 PM   #3 (permalink)
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What kinda car is it...?
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Old 09-02-2008, 08:30 PM   #4 (permalink)
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P0172 code mean-"system is too rich"(not enough air comes to engine)
It could be faulty or dirty MAF sensor.The use of "oiled",cone type air filters can cause the MAF to become dirty if the filter is over-oiled. It could be very dirty regular air filter(when did you change it last time?) It could be a fuel pressure or delivery problem(dirty fuel filter or faulty fuel pressure regulator)
Start with these simple solutions.I personally doubt ,that oxygen sensor is faulty.It only gives you indications of limited air in the system.
Good luck !
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