P0056 - Ho2S Heater Control Circuit (Bank 1, Sensor 2) - DTC Chart

P0056 - HO2S HEATER CONTROL CIRCUIT (BANK 1, SENSOR 2) - DTC CHART

Description: The PCM controls the heated oxygen sensor bank 1, sensor 2 (HO2S12) heater ON and OFF duty cycle to maintain a calibrated temperature. This DTC sets when the sensor does not warm up to the required temperature in a calibrated amount of time. This DTC also sets when the PCM is not able to maintain the required temperature after the sensor is warm.
Possible Causes: VPWR circuit open HTR12 circuit open HTR12 circuit short Incorrect connections Damaged or corroded terminals Exhaust temperature significantly higher than expected Damaged HO2S12
Diagnostic Aids: Inspect the connectors for signs of damage, water intrusion or corrosion.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to Pinpoint Test DW .