Technical Definition:
Heated Oxygen Sensor (HO2S) Heater Control Circuit High (Bank 2 – Sensor 1)
Trouble Code: P0052
Address: 0x0052
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Address: 0x0052
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:
Possible Causes:
- A short in the heater circuit in the sensor
- A failed O2 sensor heater
- Wiring/connectors broken/frayed leading to sensor and/or relay
- Failed PCM/ECM
Possible Symptoms:
HO2S Heater Control Circuit High Bank 2 Sensor 1
Possible Solutions:
- check for 12 volts at the heater circuit feed (hint: unplug the sensor and check at the wiring connector to do this measurement)
- check the ground circuit for continuity
- measure the resistance of the heater circuit (done on the sensor itself)
- measure the resistance and voltage of the wiring
OBD-II Trouble Code Type:
Diagnostic Step:
Tech Notes:
– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground
– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection
– Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse
– Faulty Engine Control Module (ECM)