P0055 - HO2S Heater Resistance (Bank 1 Sensor 3)

System Information

The heater circuit on a heated Oxygen / Lambda sensor is used to provide the heat required for correct sensor operation after cold start and also to maintain a consistent temperature during certain running conditions.
The heater circuit supply voltage can either be directly supplied from the ECM or it can be supplied via a relay, this would usually be the main system relay. The heater earth circuit will normally be controlled directly by the ECM

Fault Code Explained

The ECM monitors the current in the circuit and has detected a fault which indicates the circuit resistance is incorrect. This may be due to the sensor heater circuit or the circuit wiring

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