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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid)) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> P0135 - O2 Heater Circuit (Bank 1, Sensor 1)

P0135 - O2 Heater Circuit (Bank 1, Sensor 1)

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DTC DESCRIPTION P0135 - O2 HEATER CIRCUIT (BANK 1, SENSOR 1)

Description:  This DTC sets when an open or short circuit is detected or the heater current draw exceeds a calibrated limit.
Possible Causes: 
  • UO2SHTR11 circuit open (if equipped)
  • UO2SHTR11 circuit short to voltage (if equipped)
  • HTR11 circuit open (if equipped)
  • HTR11 circuit short to voltage (if equipped)
  • VPWR circuit open
  • Low battery voltage
  • Water in the harness connector
  • Corrosion
  • Incorrect connections
  • Damaged universal heated oxygen sensor bank 1, sensor 1 (HO2S11) heater (if equipped)
  • Damaged HO2S11 heater (if equipped)
Diagnostic Aids:  Inspect the connectors for signs of damage, water intrusion or corrosion.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
KA GO to Pinpoint Test DW .
All others GO to Pinpoint Test DZ .
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