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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls - Powertrain DTC Charts & Descriptions - (Hybrid)) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> DTC P0054: Ho2S Heater Resistance (Bank 1, Sensor 2)

DTC P0054: Ho2S Heater Resistance (Bank 1, Sensor 2)

WARNING: This page is about a different variant/trim than selected.
P0054 - HO2S HEATER RESISTANCE (BANK 1, SENSOR 2)

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