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Home >> Ford >> 2005 >> Escape Hybrid, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls - Powertrain DTC Charts & Description (Except Diesel & Hybrid)) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> DTC P0135: HO2S Circuit Malfunction (HO2S-11)

DTC P0135: HO2S Circuit Malfunction (HO2S-11)

WARNING: This page is about a different variant/trim than selected.
P0135 - HO2S 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: 
  • Vacuum hose disconnected on exhaust gas recirculation (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 incorrect harness connections
  • Damaged HO2S heater
Diagnostic Aids:  Wiring.
Damaged HO2S heater.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to H: Fuel Control STEP H7.
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