Fault code P0171
#1
08-23-2011, 10:10 AM
Fault code P0171
Hi
Ive got a vw bora with the fault code p0171 fuel trim system lean (bank 1)
or system too lean (bank 1) engine runs crap if i pull out the breather pipe to the rocker cover filler cap it runs ok any ideas could it be the maf sensor needs cleaning and i believe you need to use electrical circuit cleaner for this job am i correct????
Ive got a vw bora with the fault code p0171 fuel trim system lean (bank 1)
or system too lean (bank 1) engine runs crap if i pull out the breather pipe to the rocker cover filler cap it runs ok any ideas could it be the maf sensor needs cleaning and i believe you need to use electrical circuit cleaner for this job am i correct????
#3
09-07-2012, 02:45 PM
Sorry this is an old thread but I've just found it now we've added Bora to the Jetta forum.
VAG Error Code: 16555
EOBD II Error Code: P0171
VAG Error Code: 16555
EOBD II Error Code: P0171
Fault Location:
Fuel Trim (FT), System too Lean, Bank 1
Fuel Trim (FT), System too Lean, Bank 1
Possible Cause:
Intake/exhaust leak.
Secondary air injection (AIR) system.
Manifold absolute pressure (MAP) sensor (G71).
Mass air flow (MAF) sensor (G70).
Fuel pressure/pump.
Injector(s).
Evaporation emission (EVAP) canister purge valve (N80).
Heated oxygen sensor (HO2S) (G39).
Intake/exhaust leak.
Secondary air injection (AIR) system.
Manifold absolute pressure (MAP) sensor (G71).
Mass air flow (MAF) sensor (G70).
Fuel pressure/pump.
Injector(s).
Evaporation emission (EVAP) canister purge valve (N80).
Heated oxygen sensor (HO2S) (G39).
Possible Solutions:
•In the vast majority of cases, simply cleaning the Mass air flow (MAF) sensor (G70) does the trick. It's best to take it off and spray it with electronics cleaner or brake cleaner. Inspect all vacuum and PCV hoses, replace if necessary. •Check for a dirty fuel filter and proper fuel pressure.
•In the vast majority of cases, simply cleaning the Mass air flow (MAF) sensor (G70) does the trick. It's best to take it off and spray it with electronics cleaner or brake cleaner. Inspect all vacuum and PCV hoses, replace if necessary. •Check for a dirty fuel filter and proper fuel pressure.
As taken from my https://volkswagenforum.com/forum/ge...oftware-34973/
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