Lambda sensor replacement

Hi I recently had my 2000 Range Rover p38 4.6 lose power and cut out into me, r a c have told me it was due to lambda sensor faults, looking for advice on what one to replace I have used euro car parts to find the part however the is 3 options, front, back and just one that doesn’t specify, would I need to buy all 3 and replace or is there a specific one? Thanks

There are 4 on the P38 V8..

I'd replace them all.

Definitely replace all 4 with NTK or Walker brands. Not BOSCH!!!

Double post...

triple post...

Is it OK when cold? Surprised o2 sensors caused it to cut out.