Had my new-second hand turbo back exhaust fitted a week ago - including sports cat. I also fitted the BSH CAI 2 days before making the trip, and flashed to Bluefin stage 2 after the exhaust work.

Day after the 200 round trip drive to Portsmouth, the engine management light comes on.

Finally got my Bluefin to work correctly (long story for another time!) and it has read fault code P0420 - catalyst system efficiency below threshold bank 1.

Do you think this code being thrown is just these mods settling down, or is it something I should start to get worried about? :(

I've cleared the fault so will see if it pops up again tomorrow.

Pop up again it has :(

I take it from the lack of replies that everyone else with a TBE hasn't experienced this error code?

I've emailed Superchips to get their opinion as I've read that some stage 2 maps (GIAC and REVO were mentioned) compensate for something or other due to the TBE and the code is not thrown.

100 or 200 cel cat?

It's 200 cel.

In fairness to Superchippies I got a quick reply to my email this morning and have a new Stag 2 map to try so I'll stick that on tonight and see what happens.