03 Jetta Wagon: fault codes: P0411, P0171
#1
03 Jetta Wagon: fault codes: P0411, P0171
I thought these codes may have been from loose hoses ducting from the turbo charger. I fixed all the plastic hose connections. I reset these codes, but a couple days later, they returned. The vehicle will not pass emissions until these codes are reset.
P0411: Secondary Air Injection System Incorrect Flow Detected.
P0171: System Too Lean Bank 1
What is creating this problem? What components need to be replaced in order for me to reset these codes again?
Thanks!
Sean
P0411: Secondary Air Injection System Incorrect Flow Detected.
P0171: System Too Lean Bank 1
What is creating this problem? What components need to be replaced in order for me to reset these codes again?
Thanks!
Sean
#2
Welcome to the forum Sean.
VAG Error Code: 16795
VAG Error Code: 16795
EOBD II Error Code: P0411
Fault Location:
Secondary air injection (AIR) system - incorrect flow detected
Secondary air injection (AIR) system - incorrect flow detected
Possible Cause:
Secondary air injection (AIR) pump.
Secondary air injection (AIR) valve.
Secondary air injection (AIR) hose(s).
Secondary air injection (AIR) pump.
Secondary air injection (AIR) valve.
Secondary air injection (AIR) hose(s).
VAG Error Code: 16555
EOBD II Error Code: P0171
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.
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.
Heated oxygen sensor (HO2S) (G39).
Manifold absolute pressure (MAP) sensor (G71).
Mass air flow (MAF) sensor (G70).
Fuel pressure/pump.
Injector(s).
Evaporation emission (EVAP) canister purge valve.
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 Free EOBD II Error Codes software
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