P2251

SAE VAG Description
P2251 18683 O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1

Oxygen sensor and oxygen sensor control before catalytic converter
Oxygen sensor and oxygen sensor control before catalytic converter, checking [1][2]Oxygen Sensor Before Catalyst, Checking

Oxygen sensor heater for oxygen sensor before catalytic converter
Oxygen sensor heater for oxygen sensor before Three Way Catalytic Converter (TWC), checking Heater Check