Just had Catalytic convertor replaced on bank1 side ( driver side UK) and 2 weeks later I'm getting a very intermittent MIL on with p0174 error on Bank 2 . I can clear code and it randomly returns. It does feel like it's when I'm initially starting up and first move, that it occurs.
Haven't had this while driving, in middle of a long drive for example. Everything feels as normal (well much better than before cat replacement lol) and this didn't happen until at least 2 weeks after new cat (which was other bank anyway)

Any ideas?

what made you change the cat RR 2005 4.4 petrol
Any spelling mistakes are the fault of spellchecker
Previous MG J2, CITROEN light 15 x 2 gone unfortunately
Present MERC 180e, RANGE ROVER L322, JAGUAR XJS, MERC 280SE, MG F, JAGUAR S-Type 6v 2003, jaguar s-type 8v 2004, Ford Cougar

Bank 1 was misfiring on 4 cylinders. Checked everything, coils etc and finally after 3 weeks gave in and put into Land Rover. They found the cat was badly broken and causing misread on sensors etc and making it misfire. Been great since replacement

thanks RR 2005 4.4 petrol
Any spelling mistakes are the fault of spellchecker
Previous MG J2, CITROEN light 15 x 2 gone unfortunately
Present MERC 180e, RANGE ROVER L322, JAGUAR XJS, MERC 280SE, MG F, JAGUAR S-Type 6v 2003, jaguar s-type 8v 2004, Ford Cougar