So far I have only found the whole assembly with the pre and cat to be available.. bout 500 bucks. Then the last cat is bout $100. Exhaust smells rich so maybe an O2 sensor is to blame. CEL went off for about 300 miles and has been back on for the last 200 or so. Being careful not to go fallin down ...

My 04 base model got a P 0420 code so I looked into converter replacement.Over $600! Has an assembly with 2 converters then a 3rd converter? (removed).. How can you be sure all 3 are necessary? Never had a vehicle with this setup before.