P0171

SAE VAG Description
P0171 16555 System Too Lean Bank 1

Fuel Trim - System Too Lean

- Combination valve for Secondary Air Injection (AIR) system checking function and for proper seal Combination Valve For Secondary Air Injection (Air) System, Checking Function and For Proper Seal
- Fuel injectors checking Fuel Injectors, Checking
- Fuel Pump (FP) electrical testing Fuel Pump Electrically, Checking
- Intake system checking for leaks (false air) Intake System, Checking For Leaks (False/Unmetered Air)
- Secondary Air Injection (AIR) system checking for proper seal
- System pressure and residual pressure checking Fuel System Pressure and Residual Pressure, Checking