or piggy backs ?
NTK pics on Rock Auto show just the sensor,
while Denso and other s show the wire/plug.
I am assuming you would want the new connection ?
should they both be replaced ? I really only need the front since i am getting a new y-pipe built up to the cat.
thanks for any info...

 

All? No, you can buy them both ways.

However, the RockAuto pics sometimes don't show things like the wires and plugs since the company doesn't show the wires and plugs in the photos RockAuto uses ...

As a hint, though, "OE Fit" will have the plug and wires; others may, or may not.

RwP