o2 sensor problem

I have hooker longtubes on my car. I have the stock 46k mile o2 sensor in the passenger side header. But on the driver side its been through at least 4. I had a new one put in yesterday and the codes cleared and today the ses light came back on, after only TWELVE miles. They put a tech 2 scanner on it and the passenger side was fluxuating between 400-600 (if i remember correctly) but the driver side started at about 100 then dropped to 0-4 then we took it for a ride and it started to operate in a normal range. Why do I have to keep putting o2 sensors on the driver side but the passenger side is the original one that came with the car? There are also o2 extenders on the car so the wires aren't cut and spliced. The headers are also uncoated. Codes were bad o2 bank 1, random misfire, something about the o2 heater, 1133, 1155. Would a small exhaust leak after the o2 sensor cause it to foul out?

J D

Air leaks are the devil to O2 sensors.

What if there was an exhaust leak down stream of the o2 sensor could that mess the o2 sensor up. I know the band clamps on her car are missing from the slip tube part of the ypipe. Where the header part of the y and the rest of the y meet up. These are hooker headers and a hooker y-pipe uncoated.

Joe