Possible causes
- Oxygen sensor
- Oxygen sensor circuit
- O2 Sensor Heater Control Circuit
- Engine Control Module (ECM)
This code indicates that the air/fuel ratio (A/F) sensor heater system for Bank 1, Sensor 1 is malfunctioning. The A/F sensor heater is responsible for heating the oxygen sensor to its proper operating temperature. If the heater is not working properly, the oxygen sensor will not be able to accurately measure the amount of oxygen in the exhaust gas, which can lead to an incorrect air/fuel mixture and poor engine performance.
