I have been getting P0430 about once a while after I reset couple of months ago. This past week again, I have gotten the P0430 and my 2001 X5 with 3.0L had 200K miles on it. My car runs great. Acceleration is good, no rattles from underneath, no indication that anything is wrong except for the CEL. I replaced the both post-cat and precat oxygen sensors about 6 months ago with a new Bosch sensors and also replaced sparks plug and ignition coils.

Thanks,
Henry