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

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

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: HEATED OXYGEN SENSOR (HO2S) .
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