Engine-Codes
 
OBDII Code List
 
P0040 2007 FORD FUSION

P0040 2007 FORD FUSION - Oxygen Sensor Signal Swapped Bank 1 Sensor 1 / Bank 2 Sensor 1

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3  What does this mean?

Possible causes

  • Crossed HO2S harness connectors
  • Crossed HO2S wiring at the harness connectors
  • Crossed HO2S wiring at the PCM connectors
  • Bank 1 Sensor 1 / Bank 2 Sensor 1 harness is open or shorted
  • Bank 1 Sensor 1 / Bank 2 Sensor 1 circuit connectors (wrong connection)
  • Faulty Engine Control Module (ECM)
  • Tech notes

    The oxygen sensor connector might be connected incorrectly.

    Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • P0040 2007 Ford Fusion 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.

    OBDII Code P0040 2007 Ford Fusion - Oxygen Sensor Signal Swapped Bank 1 Sensor 1 / Bank 2 Sensor 1 - Engine-Codes.com

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