420 error code
#1
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I'm having a little problem with my 2001 Jaguar XK8 convertible. I have just replaced the upper oxygen sensor on bank one and the car is now running a little rough but smooths out after it warms up. After driving about 10 or 15 miles and now get a 420 catalytic control error on bank 1 the same one I replace the oxygen sensor on. I have been a backyard mechanic for many many years but I don't have any of the sophisticated Electronics Equipment other than a little cheap code reader or any specially tools. I doubt very seriously that the catalytic converter is bad and I've read a bunch of descriptions describing the 420 errors and what the possible solutions for them. My question is since the new sensor was installed should I have also replaced the lower oxygen sensor on bank one? I really just don't wanna start replacing parts 'cause they're not exactly cheap and some of them are pretty hard physically to replace :-). I don't think Jaguars are noted for their plentiful room to work like a 1950s Chevy. I mean to replace the oxygen sensor your supposed to take off the entire exhaust system. Really!!!
#2
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Always look in the Sticky's at the top of each forum...first off your kinda in the wrong forum, this is the X308 section, you want X100. Here's yours....https://www.jaguarforums.com/forum/xk8-xkr-x100-17/
When you do any vehicle code check, put the vehicle name and P code to get more specific returns on searches....example...Jaguar P0420...any pulled code returning just 3 digits you simply put a zero in between the P and the first number as shown.
Review this write up I did, your engine bay is a bit tighter, but the process is similar, but maybe it will give you some confidence.... https://www.jaguarforums.com/forum/x...cement-195018/
When you do any vehicle code check, put the vehicle name and P code to get more specific returns on searches....example...Jaguar P0420...any pulled code returning just 3 digits you simply put a zero in between the P and the first number as shown.
Review this write up I did, your engine bay is a bit tighter, but the process is similar, but maybe it will give you some confidence.... https://www.jaguarforums.com/forum/x...cement-195018/
Last edited by Highhorse; 12-11-2023 at 07:11 PM.
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