DTC 16804

SAE VAG Description
P0420 16804 Catalyst System Efficiency Below Threshold Bank 1

Catalytic converter
- Three Way Catalytic Converter (TWC), checking Three Way Catalytic Converter (TWC), Checking

Oxygen sensor and oxygen sensor control before catalytic converter
- Oxygen sensor and oxygen sensor regulation before catalytic converter, checking Oxygen Sensor and Sensor Regulation Before Catalyst, Checking

Oxygen sensor and oxygen sensor control behind catalytic converter
- Oxygen sensor and oxygen sensor control regulation behind catalytic converter, checking Oxygen Sensor and Sensor Regulation Behind Catalyst, Checking