R AWD BY 2017
I had an approved exhaust (manufacturer PIECHA) installed. After about 20 miles engine check light and error code P0430 (bank2). I have seid over a year already installed new stainless steel cats (400 cells), which work much better than the OEM cats made of ceramics. Never had problems, as well as all exhaust values complied with for a year. After there was only on bank 2 an error, I do not believe that the cat does not work properly. Rather suspect the lambda sensor could be defective.
Error was deleted, so far no more appeared. However, has also come only under full load. On bench 1 I have already installed a year ago a new lambda sensor, but for technical reasons, it had not indicated an error!

My questions:
1. can a new exhaust system affect the effectiveness of the Kats? I assume everything is installed correctly and no false air is created.
2. the vehicle was very often on and off to come from lift and parking during installation. Maybe one probe was just full of too much soot. Could something like that also cause a code?

Will times on suspicion now replace the of bank 2 lambda probe (after cat), since I have only a brand new one lying around here, hopefully the error no longer comes after that. My Kats have only run 5,000 kilometers, these are actually like new, can not be broken.

Is there any experience on this in the forum? Thank you so much
BR Andi