P0171

SAE VAG Description
P0171 16555 System Too Lean Bank 1

Exhaust system
- Exhaust system components, removing and installing. Service and Repair

Fuel injectors
- Fuel injectors, checking. Fuel Injectors, Checking

Fuel pressure regulator and residual pressure
- Fuel pressure regulator and residual pressure, checking. Fuel Pressure Regulator and Residual Pressure, Checking

Fuel Pump (FP)
- Fuel pump, checking. Fuel Pump Checking

Intake system
- Intake system for leaks (unmetered air), checking. Intake Air System, Checking For Leaks (False/Unmetered Air)

Secondary Air Injection (AIR) system
- Secondary air system for proper seal, checking. Combination Valve For Secondary AIR, Checking Function and Proper Seal

Note: Check vacuum lines for leaks.