p0171 and p0174 code help,,01 740i - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 05-13-2009, 12:05 AM
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Exclamation p0171 and p0174 code help,,01 740i

2001 bmw 740i 4.4l

i have this 2 codes coming up p0171 and p0174

anyone have any advice what to check for ,,

i appreciate in advance,,,

thank you

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#2 (permalink) Old 05-13-2009, 07:03 AM
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0171 & 0174

Mean that both banks are running lean.

You may have a vaccum leak or the o2 sensors are ageing or the PCV valve has gone.

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#3 (permalink) Old 05-13-2009, 09:31 AM
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can it be from the maf sensor also?

the maf sensor plastic case was broken,,so i replace with a use one and left the maf sensor too,,,
maybe i should put the one from before back in maybe thats why,,dont know if this was the problem before,,i purchase the car demage,,not running..

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