gmb2000

Should I change the O2 sensers when I put on a new CAT?

97BlackAckCL

iTrader: (6)

Test them, if they're still functioning, reuse them

bRunCL

iTrader: (1)

if you are replacing the cat because it was shot then more than likely you will have to replace the second sensor(the one on the cat), but if you are just switching to a new converter for someother reason then it shouldn't be a problem. Either way its a good idea to put some antisieze on the threads of the new or old sensor so it's easier to remove in the future.

97BlackAckCL

iTrader: (6)