Anyone give me any info on the P0420 code?

P0420 Catalyst System Low Efficiency (BANK 1) - so does this mean my cat is bad? its the magnaflow high flow cat.

which part number? i used 91035 and i got that code. i switched to 94035 and i have no problems right now



Land Pirates sail the open roads
DISCLAIMER: If anything I say offends you, I don't care..wear a helmet. Also, the information
I post is what I know to the best of my knowledge. If I am wrong, please correct me so that
others as well as myself may learn.
Premium sinc 6-17-04

i think its the 91035. is there any way i can check to tell?