did it myself
all the work i done bar a tech2 diagnostics fee that i have now got back due to a failing precat that they failed to diagnose
so in total all the work i carried out on the car cost me peanuts except the new cat that cost 115, the parts i got from ecky for peanuts
so it has cost me around 200 quid to fully get down to the problem
about 50 labour hours on my side as this has been going on since beginning of november
if you cant be arsed to remove precat then go buy a new cat from a parts place and ask em that u want one without the precat and fit yourself, takes about an hour or 2 to fit the cat yourself
2 bolts on centre section flange and 3 bolts on the downpipe to manifold flange - 13 on the back and 16 on the front
undo the front lambda connection and try and remove the back lambda from the cat as this saves trying to hook it back up to the clips underneath, you can pull the cat out with the front lambda connected and take it out without doing it under the car
i would use to some carb cleaner on the lambdas and give em a quick going over, dont use wd40 but use wd40 on all the bolts and let it soak for a few mins, i also drowned the back lambda in wd40 to get the bolt loose but make sure no wd40 gets on the sensor hence carb cleaner
