Hi Paul,

I had to sort some issues with a 3.2 one of these earlier this year after it had an auto gear box fitted at a main dealer.

It was also reporting a cat efficiency code a few days later but on bank 1, I dont know if yours is the same but I was concerned because the post cat lambda sensors were positioned in between the pre cat and main cat on the down pipe. I had found some info on the omega owners forum about this fault and it was suggested that threaded bosses be welded in to the down pipe after the main cat and the post cat sensors be moved down the line and the original holes plugged.

Anyway, fortunatley before getting carried away i checked the wiring against a diagram and found that the pre and post cat sensors had been incorrectly plugged in to the loom (reversed), the multi plugs are the same.

Might be worth a look incase kwik fit got it wrong (as if!)

Hope this helps, regards

Mark