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Can anyone tell me how to replace the oxygen sensor on an BA XR6 turbo? Is it something I can do myself or does it need to go to a mechanic?

Thanks I've had one popular tuning workshop telling me that I need to get it on the dyno and get it tuned because as the car gets older parts arent functioning at 100% anymore and you can not adjust the factory tune. He also says they dont use the codes from the ECU because often they are a side effect of another problem. This is going to cost over $1K. Someone else must have had similar problems??

Hi there I need some advice please? I got an 04 BA xr6 turbo 5sp. Am having a problem where the engine idles rough. It drops to 400 rpm and bounced up/down and sometimes stalls when I pull the car up at lights etc. It's worse when The engine is cold or cold morning or night. Got it on a computer and got the following ecu error codes. 1131 1132 1057 0325 any ideas?