P2CAB and P2CA7=lambda/precat o2 sensors, my car threw the same two codes when mine went bad a few months back. The car will start to misfire on cold start and generally drive poorly, which makes perfect sense seeing as how it'll have a tough time getting AFRs correct. If you're under warranty just take it in (unmodded obviously), if not, O2 sensors aren't too brutal from a cost standpoint. Any competent shop can take care of it quickly.
E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII