[kjewer1]

In our case, everything will be "bank 1." With a v6 or v8, one side will be bank one and the other bank 2. I can't recall if the code says front/rear, but thats the terminolgy we use. If you are not getting a Catalyst System Efficiency Below Threshold (bank 1) DTC, odds are its the front sensor though. I would see if the code gives it away, if not, do the front if you arent also getting the above mentioned DTC.