DTC 16556

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. Evaporative Emission (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 and oxygen sensor control before catalytic converter
- Oxygen sensor and oxygen sensor control before catalytic converter, checking. Oxygen Sensor and Oxygen Sensor Control Before Catalytic Converter, Checking
- Check wiring diagram.

Oxygen sensor and oxygen sensor control behind catalytic converter
- Oxygen sensor and oxygen sensor control behind catalytic converter. Oxygen Sensor and Oxygen Sensor Control Behind Catalytic Converter, Checking
- Check wiring diagram.

Oxygen sensor and oxygen sensor control in center catalytic converter
- Oxygen sensor and oxygen sensor control in center catalytic converter, checking (engine code BBW).
- Check wiring diagram.