Gen1 3.9 O2 sensors

[55CrownVic]

Are all four oxygen sensors the same part #? Some list them with the same part number for upstream and downstream and some manufacturers list them as different numbers. Is the Bosch 15717 a good choice and will they work in all locations? Thanks, Ben

 

[joegr]

Surprisingly, Bosch is not a good choice at all for O2 sensors on the LS. Motorcraft, NTK, or Denso would be a much better choice.
Front and back are different parts due to the connectors and wire length. It's possible to have the same part for both, but the wiring won't be great.

 

[AmsterDutch]

I agree Bosch don't merry well at all with the LS...NTKs have worked extremely well for my LSes

 

[04_Sport_LS]

NTK are GTG. Bosch will give you a bunch of DTC codes. I think they are oversensitive to minor fluctuations.