I am starting to get a code for one of them, so I figured I might as well replace them both. Anyone find a deal somewhere?

 

Hmm so far it looks like 123autoparts sells them $84.34 each, plus 9.95 for shipping. Total cost 178.63

 

Check RockAuto Parts Catalog with the 5% discount - 764F8C71BC7E

 

Maybe cross shop Amazon?

Denso claims to be the OEM oxygen sensor mfgr for Jaguar

STR O2 Sensor Part numbers.

Front (air/fuel sensor) 234-9030
Rear (oxygen sensor) 234-4735
.
.
.

 

I check, amazon was second cheapest by I think less than a $5 difference. I just wish there was a way to clean/reuse them!

 

This may be too late, just came upon your question. I get mine at AutoZone or Advance
Bosch., exact fit. Don't buy universal ones.

 

That's a BIG +1 - universal O2 sensors suck!

 

Check partsgeek oem to aftermarket and waaaaayyyyyymore jaguar parts the rockauto

 

I was looking at them today - various options at keen prices.
Denso, NTK, Bosch and Delphi all under $30 each

Partsgeek seem to be similar prices

I may replace mine on my 2001 model on a "just in case" basis at those prices

 

Denso/NTK, are the best options.