upops

I have a 2004 Audi A6 Quattro Automatic 3.0L with 99k miles and I am getting CEL of P0431 Catalytic Converter Bank 2. I plan on keeping this car for another 3-4 years at the most. So I need a new catalytic converter but is there a good aftermarket one? All the Muffler shops I went to say I need the original cat from the dealer. Anyone have good experiences from a aftermarket one? If so which one? Or know where I can get the original for cheap? Also which side is bank 2 on the 3.0

Thanks!

Kris Hansen

Replace the rear O2 sensors before you replace catalysts, since they are responsible for determining the health of the cats.

raj99

I fixed the problem by replacing the O2 sensors and that's all that was required...have never seen the code again (over 3 years ago).