seanisonfire: like axe s & Kujotk said these things may fix it and even if it doesnt, it sure wont hurt
br3ndan:
1. remove the engine heat shield
2. remove the three bolts holding the brace, then remove it
3. undo the screws holding on the heat cover over the dump pipe and remove it
4. replace the o2 sensor either with a 22mm open ended spanner or you can get a oxygen sensor socket from Repco (when i asked they said they would have to order it from over east so I just used the open ender)
5.then reverse steps 3-1