Hi all. I have a 2003 x-type that I just changed the cat on bank 2. I have new codes, P0420, and P0430. Is there anything that would cause this to happen? I have cleared them ones, and they come back. The cat and O2 sensor on bank 1 is only 2 years old. The cat and O2 on bank 2 have just bean replaced. Any suggestions?

Thanks Snowman

 

jaghelp.com: P0420 and P0430 on you Jaguar X-type

Reading time! Those codes are set when the O2s are bad. Did you change the O2 with the right ones?