How Many Oxygen Sensors on 1st Gen 5.4 Expedition?

[tinkering]

Is there 2 or 3 or 4 oxygen sensors on the 1st Gen 5.4 Expy? I see one by the drivers side manifold exhaust flange and one further downstream on the exhaust pipe but I can't crawl under that side of the vehicle to check if there is 1 or 2 on the passenger side too?... and are they all the same part number?

 

[Yupster Dog]

Is there 2 or 3 or 4 oxygen sensors on the 1st Gen 5.4 Expy?

2 upstream and 2 downstream

to check if there is 1 or 2 on the passenger side too?... and are they all the same part number?

OEM has 2 part numbers and the difference is the length of the wires attached to the o2 sensor (2 shorter than the other 2) Other brands have one part number for all four. (all long wires)

 

[tinkering]

2 upstream and 2 downstream



OEM has 2 part numbers and the difference is the length of the wires attached to the o2 sensor (2 shorter than the other 2) Other brands have one part number for all four. (all long wires)

Thanks. That is excellent information to know.

 

[tinkering]

Do all makes use a similar configuration, 2 up and 2 down? Do you know?