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Home >> Ford >> 2005 >> Focus ZX5 S, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Powertrain DTC Charts & Description (Except Diesel & Hybrid) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> DTC P005x: HO2S Heater Resistance (HO2S11, HO2S12, HO2S13, HO2S21)

DTC P005x: HO2S Heater Resistance (HO2S11, HO2S12, HO2S13, HO2S21)

NOTE: 'x' equals any number 0 through 9 or letter A through F.
P005X - HO2S HEATER RESISTANCE (HO2S11, HO2S12, HO2S13, HO2S21)

Description:  Heater current requirements too low or high in the heated oxygen sensor (HO2S) heater control circuit (HO2S11, HO2S12, HO2S13, HO2S21).
Possible Causes: 
  • VPWR circuit open
  • HO2S heater circuit open
  • HO2S heater circuit short in the harness
  • Damaged HO2S heater
Diagnostic Aids:  Inspect connectors for signs of damage, water ingress, corrosion, etc.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to H: Fuel Control STEP H11.