Well, I was under the impression that there were 4 o2 sensors on our 2013 XJ and I just talked to the dealer told me that there 3 on each side. Does anybody have an idea about this, please? I was planning on ordering just 4 to replace all of them.

 

I know for a fact that the V6 and V8 F-Type has six O2 sensors and has done so from the get go in 2013 so I reckon it is odds on the 2013 XJ is the same.
Each side has one pre-cat, one mid-cat and one post-cat, each cat is made up of two bricks hence the mid-cat O2 sensor, and I have never been able to find out exactly what the mid-cat sensor measures or does!

 

Thanks That helps a lot

 

Let’s find out…
One.. Two…Three
(CRUNCH)
Three; each side.