LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> DTC Diagnosis >> 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

DTC 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 
E-Series 4.6L,
E-Series 5.4L,
Expedition,
F-150,
Flex,
MKS,
Navigator,
Sable PZEV,
Taurus PZEV,
Taurus X
PZEV		 - GO to Pinpoint Test DZ . -
All others - GO to Pinpoint Test DW . -
scientia non olet · About LEMON Manuals