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Home >> Ford >> 2011 >> Focus S, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions - DTC P0001 Through DTC P0217 - (Except Diesel & Hybrid) >> DTC P0040: Oxygen Sensor Signals Swapped Bank 1 Sensor 1/Bank 2 Sensor 1

DTC P0040: Oxygen Sensor Signals Swapped Bank 1 Sensor 1/Bank 2 Sensor 1

P0040 - OXYGEN SENSOR SIGNALS SWAPPED BANK 1 SENSOR 1/BANK 2 SENSOR 1

Description:  The heated oxygen sensor (HO2S) monitor determines if the HO2S signal response for a fuel shift corresponds to the correct engine bank. The test fails when there is no response from the HO2S being tested.
Possible Causes: 
  • Crossed HO2S harness connectors
  • Crossed HO2S wiring at the harness connectors
  • Crossed HO2S wiring at the PCM connectors
Diagnostic Aids:  Connect the HO2S connector to the correct bank.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Edge, Escape/Mariner 2.5L Automatic Transmission, Escape/Mariner 3.0L,
E-Series 4.6L,
E-Series 5.4L,
Expedition,
Explorer,
F-150,
Flex,
F-Series Super Duty,
Fusion 2.5L,
Fusion 3.0L,
Milan,
MKS,
MKT,
MKX,
Mustang,
Navigator,
Taurus		 GO to PINPOINT TEST DZ .
All others GO to PINPOINT TEST DW .
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