I had a check engine light on. I scanned the computer via the OBDll port and got an emissions low threshold fault code for bank 2.
Not knowing if it was the oxygen sensor or catalytic converter, I decided to swap bank 1 and bank 2 oxygen sensors. I cleared the codes and drove the car until the check engine light came back on.
I then scanned for fault codes and got two codes. They were bank 1 oxygen sensor low voltage and bank 2 oxygen sensor low voltage.
So, after swapping o2 sensors, that's what I ended up with for fault codes. The o2 sensors I swapped are the ones in the catalytic converters, not the ones prior to the converters. Attached are the codes I have.

 

Maybe take a look at this thread .

https://www.jaguarforums.com/forum/x...-p0157-170137/

Could also be a vacume air leak . Or maf issue or crook cats.