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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 753 (Engine Controls - Powertrain DTC Charts & Descriptions - CNG, Flex-Fuel & Gasoline) >> Diagnostic Trouble Code (DTC) Charts >> P0135: Ho2S Sensor Circuit Malfunction (Ho2S-11)

P0135: Ho2S Sensor Circuit Malfunction (Ho2S-11)

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P0135 - HO2S SENSOR CIRCUIT MALFUNCTION (HO2S-11)

Description:  During testing the HO2S heaters are checked for opens/shorts and excessive current draw. The test fails when the current draw exceeds a calibrated limit and/or an open or short is detected.
Possible Causes: 
  • Vacuum hose disconnected on EGR System Module (ESM) applications.
  • Short to VPWR in the harness or HO2S.
  • Water in the harness connector.
  • Open VPWR circuit.
  • Open GND circuit.
  • Low battery voltage.
  • Corrosion or poor mating terminals and wiring.
  • Damaged HO2S heater.
  • Damaged PCM.
Diagnostic Aids: 
  • Wiring.
  • Damaged HO2S heater.
  • Damaged PCM.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Gasoline GO to PINPOINT TEST H: FUEL CONTROL Step 10. GO to PINPOINT TEST H: FUEL CONTROL Step 10. GO to PINPOINT TEST H: FUEL CONTROL Step 10.
Dedicated NGV GO to PINPOINT TEST HA: NATURAL GAS FUEL CONTROL Step 1. GO to PINPOINT TEST HA: NATURAL GAS FUEL CONTROL Step 1. GO to PINPOINT TEST HA: NATURAL GAS FUEL CONTROL Step 1.
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