I guess I'm the first post in your new forum! I recently got a CEL with a trouble code P0430 (catalytic converter bank 2 below threshold). The car's been running completely normally and I've had none of the common bad cat symptoms (odd smells, performance issues, excess heat, rattling, etc). I was planning on replacing my B2S2 oxygen sensor first, but would love to get the input from a dealership. What do you guys usually see as the most common cause of this trouble code?