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P0040 – 2009_FORD_FUSION

Code : P0040
Make : 2009_FORD_FUSION
Description : P0040 2009 FORD FUSION Oxygen Sensor Signal Swapped Bank 1 Sensor 1 / Bank 2 Sensor 1
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
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.

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