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:)

Welcome to the forum Sean. Attachment 3238

VAG Error Code: 16795

Fault Location:

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.
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.

As taken from my Free EOBD II Error Codes software

Thank you Keith for your quick response!