P0172

SAE VAG Description
P0172 16556 System Too Rich Bank 1

Evaporative Emission (EVAP) Canister Purge Regulator Valve
- Evaporative Emission (EVAP) canister purge regulator valve, checking. EVAP Canister Purge Regulator Valve, Checking

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

Oxygen Sensor (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC)
- Oxygen Sensor (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC), checking. O2 Sensor and O2 Sensor Control Before TWC
- Wiring Diagram.

Oxygen Sensor (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC)
- Oxygen Sensor (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC), checking. O2 Sensor and O2 Sensor Control Behind TWC
- Wiring Diagram.