So I went down to my dads who used to be a mechanic so he could change my centre pipe and do the other stuff. And it's a good job I did change that pipe as it had a massive hole in and was just rusted so much, and the o2 sensor was literally stuck in it was like it was welded but we managed to get it off as my dad had a bit that helped make it more secure. After changing the centre pipe and doing an engine flush with new oil and filter, then a coolant flush with the steel seal. Everything seemed perfect until the engine management light came on now my car sounded so much better and healthy but this light was on which was weird but no oil pressure light or anything so got rid of that. My dad had an OBD2 reader and read the codes which came us as P0036 and P0141 which is H2OS bank sensor or somert?? Please can you help me with this, I am not sure what to do??