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

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

Description:  During testing the heated oxygen sensor (HO2S) heaters are checked for open and short circuits and excessive current draw. The test fails when the current draw exceeds a calibrated limit or an open or short circuit is detected.
Possible Causes: 
  • UO2SHTR circuit short to voltage
  • Water in the harness connector
  • Open VPWR circuit
  • Open UO2SHTR circuit
  • Open GND circuit
  • Low battery voltage
  • Corrosion
  • Incorrect connections
  • Damaged 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 
Edge,
Escape/Mariner 2.5L
Automatic
Transmission,
Escape/Mariner
3.0L,
E-Series 4.6L,
E-Series 5.4L,
Expedition,
Explorer,
F-150,
Flex,
F-Series Super Duty,
Fusion 2.5L,
Fusion 3.0L,
Milan,
MKS,
MKT,
MKX,
Mustang,
Navigator,
Taurus		 GO to PINPOINT TEST DZ .
All others GO to PINPOINT TEST DW .
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