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DTC P0135: O2 Heater Circuit (Bank 1, Sensor 1)

DTC P0135: O2 HEATER CIRCUIT (BANK 1, SENSOR 1)

Description:  This DTC sets when an open or short circuit is detected or the HO2S heater current draw exceeds a calibrated limit.
Possible Causes: 
  • UO2SHTR circuit open (if equipped)
  • UO2SHTR circuit short to voltage (if equipped)
  • HO2S HTR11 circuit open (if equipped)
  • HO2S HTR11 circuit short to voltage (if equipped)
  • VPWR circuit open
  • GND circuit open
  • Low battery voltage
  • Water in the harness connector
  • Corrosion
  • Incorrect connections
  • Damaged HO2S heater
  • Damaged universal HO2S heater
Diagnostic Aids:  Inspect the connectors for signs of damage, water ingress, or corrosion.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Fiesta, Transit Connect GO to PINPOINT TEST DW .
All others GO to PINPOINT TEST DZ .
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