P0171

SAE VAG Description
P0171 16555 System Too Lean Bank 1

Exhaust System
- Exhaust manifold, front exhaust pipe with Three Way Catalytic Converter (TWC) and attachments. Exh. Manifold, Front Exh. Pipe & (TWC) With Attachments
- Exhaust system components, removing and installing. Exhaust System
- Mufflers with mounts. Service and Repair
- Three Way Catalytic Converter (TWC), checking. Three Way Catalytic Converter (TWC), Checking

Fuel Injectors
- Fuel injectors, checking. Fuel Injectors, Checking
- Output Diagnostic Test Mode (DTM) (scan tool function 03). Output Diagnostic Test Mode (DTM) (Function 03)

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

Intake system
- Intake air system checking for leaks. Intake Air System, Checking For Leaks

Secondary Air Injection (AIR) system
- Secondary Air Injection (AIR) system components, removing and installing. Service and Repair
- Secondary Air Injection (AIR) system, checking for proper seal. Combination Valve For Secondary Air Injection (Air), Checking Function and Proper Seal
- Secondary Air Injection (AIR) system, function. Secondary Air Injection (Air) Pump Motor V101, Checking

Note: Check exhaust system for leaks. Check vacuum lines for leaks.