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Old 07-17-2011, 01:28 PM   #1
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Join Date: Jun 2011
Location: Phoenix, AZ
Posts: 2
My Ride: 2005 325i
02 sensor related check engine light

Hi All,

I've already been helped by some of the threads posted. My daughter and I have both recently bought 2005 325i's, each with ~100K on them. I changed all filters in both cars but the car with ~105K miles has an engine light that has codes P0171 and P0174, which are both pre-Cat O2 sensors are reading too lean. Or, a possible low fuel pressure issue. My question is whether changing the fuel filter with built-in regulator could have triggered both of the codes? Just seems strange that both would fail at the same time. Haven't bought a Peake analyzer just yet.
Thx in advance for your help!
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Old 07-17-2011, 02:35 PM   #2
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Join Date: Aug 2007
Location: mass
Posts: 977
My Ride: 01 330ci
check the air boot that attaches to the throttle body theres an elbow that goes to an idle valve that rips with time and through's lean codes
id so replace intake boot and delete fault memory
should solve it

thats the part youll need if its ripped
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