PO171

MDF10 · 01-16-2023, 09:08 PM

Anyone run into PO171 code?
16 535i 46k
I have catted downpipe, stage 1 turbo, intake, FMIC and bm3 stage 2 tune. I installed brand new 02 sensors recently when I installed the downpipe. Anyone seen any other faulty parts for this code? The car seems to run fine.

Thanks,

Hoa · 01-17-2023, 02:01 AM

Hard to say since it’s a generic code. Best way to figure it out is to get a BMW diagnostic tool like carly, bimmerlink or ISTA. It will give you more details. ISTA is the best since it give you test plans.

That generic code is saying your vehicle is running too lean. Engine is getting more air than fuel. Could be a vacuum leak or fuel related like injectors, fuel pump etc.

01-16-2023, 09:08 PM	#1
MDF10 New Member 11 Rep 23 Posts Drives: 2016 BMW 535i M-Sport Join Date: Apr 2020 Location: South Florida iTrader: (0)	PO171 Anyone run into PO171 code? 16 535i 46k I have catted downpipe, stage 1 turbo, intake, FMIC and bm3 stage 2 tune. I installed brand new 02 sensors recently when I installed the downpipe. Anyone seen any other faulty parts for this code? The car seems to run fine. Thanks, __________________ 2016 535i M-sport 18% tint-gloss black dual slat front grille and gloss black door handle insert-gloss black M5 style rear spoiler-IND gloss black fender trim-IND painted front reflector-Goldenwrench Supply Co. tail light overlay kit
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01-17-2023, 02:01 AM	#2
Hoa Major 513 Rep 1,356 Posts Drives: BMW Join Date: May 2010 Location: GA iTrader: (9)	Hard to say since it’s a generic code. Best way to figure it out is to get a BMW diagnostic tool like carly, bimmerlink or ISTA. It will give you more details. ISTA is the best since it give you test plans. That generic code is saying your vehicle is running too lean. Engine is getting more air than fuel. Could be a vacuum leak or fuel related like injectors, fuel pump etc.
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