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Ford O2 sensors, same or different? (lemmy.world)
submitted 3 months ago by to c/mechanicadvice@lemmy.world
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I noticed on the 2001 expedition I bought that it looks like they put an O2 sensor with the long cord before the cat. All the ones online say the long cord is the back one.

There is conflicting info online. Does it matter, are all o2 sensors the same? Before cat, after cat doesn't matter?

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[–] 1 point 3 months ago

It depends.

Before and after cat can have different reporting requirements depending on the system.

I'd look into the EFI system that vehicle uses to know more specifically.

You'd probably do better on a forum for that specific car - those folks tend to know really crazy specifics.

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