Error Codes P01C8, P0174, P0171

TuckerE36 · 09-09-2021, 01:47 PM

Good ole Drivetrain malfunction, pulled the codes P01C8, P0174, and P0171. Engine bank 1 and 2 too lean, fuel pressure low.

Just crossed 40k miles, thinking it could be the HPFP? Run Techron every 3k miles, since i just crossed 40k miles about to change coils and plugs.

TuckerE36 · 09-09-2021, 07:59 PM

Edit: now Extremely rough idle, CEL on and an additional code P15EF

Edit: car will no longer start….

zvery777 · 09-10-2021, 02:08 PM

Quote:

Originally Posted by TuckerE36

Edit: now Extremely rough idle, CEL on and an additional code P15EF

Edit: car will no longer start….

I would check this site out and go from there

https://bmwfault.codes/

TuckerE36 · 09-10-2021, 11:04 PM

Quote:

Originally Posted by zvery777

I would check this site out and go from there

https://bmwfault.codes/

Codes all revolve around low fuel pressure or too lean. It's the HPFP or sensor. Cant log any data because the car wont even start the idle is so rough

Going to get the car towed to Classic BMW in the morning

TuckerE36 · 09-14-2021, 07:23 PM

Classic BMW replaced bank 2 HPFP with associated seals/gaskets. Car runs great, semi annoyed they just didn't replace bank 1 HPFP while they were there but still have 2.5 years of warranty coverage left.

09-09-2021, 01:47 PM	#1
TuckerE36 Private First Class 50 Rep 156 Posts Drives: BMW 550i M Sport Join Date: Apr 2021 Location: TX iTrader: (0)	Error Codes P01C8, P0174, P0171 Good ole Drivetrain malfunction, pulled the codes P01C8, P0174, and P0171. Engine bank 1 and 2 too lean, fuel pressure low. Just crossed 40k miles, thinking it could be the HPFP? Run Techron every 3k miles, since i just crossed 40k miles about to change coils and plugs. __________________ 2014 BMW 550i M Sport- Tuned by Matt @Cedar Performance-Daily Driver 2016 Audi Q5 3.0T Prestige-Weekend Warrior 2008 Infiniti G37S Coupe 6MT-RIP 2015 Lexus RC350 FS-SOLD
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09-09-2021, 07:59 PM	#2
TuckerE36 Private First Class 50 Rep 156 Posts Drives: BMW 550i M Sport Join Date: Apr 2021 Location: TX iTrader: (0)	Edit: now Extremely rough idle, CEL on and an additional code P15EF Edit: car will no longer start…. __________________ 2014 BMW 550i M Sport- Tuned by Matt @Cedar Performance-Daily Driver 2016 Audi Q5 3.0T Prestige-Weekend Warrior 2008 Infiniti G37S Coupe 6MT-RIP 2015 Lexus RC350 FS-SOLD Last edited by TuckerE36; 09-10-2021 at 08:26 AM..
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09-14-2021, 07:23 PM	#5
TuckerE36 Private First Class 50 Rep 156 Posts Drives: BMW 550i M Sport Join Date: Apr 2021 Location: TX iTrader: (0)	Classic BMW replaced bank 2 HPFP with associated seals/gaskets. Car runs great, semi annoyed they just didn't replace bank 1 HPFP while they were there but still have 2.5 years of warranty coverage left. __________________ 2014 BMW 550i M Sport- Tuned by Matt @Cedar Performance-Daily Driver 2016 Audi Q5 3.0T Prestige-Weekend Warrior 2008 Infiniti G37S Coupe 6MT-RIP 2015 Lexus RC350 FS-SOLD
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