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DTC P0135: Ho2S Sensor Circuit Malfunction (Ho2S-11)

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P0135 - HO2S SENSOR CIRCUIT MALFUNCTION (HO2S-11)

Description:  During testing the heated oxygen sensor (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: 
  • 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.
Diagnostic Aids:  Inspect the sensor, wiring, and connectors for damage, corrosion, or water intrusion.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test DW .
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