Managed to replace front section of my Multipla JTD exhaust which was blowing for a couple of months. Initially it was liveable with but the engine fault light came up and it got a bit fumey so thought I had better fix it. Niavely I thought the engine control light would go out once the pipe was fixed assuming it was related. Also can't rev beyond 3000 rpms also so hills are interesting! I was going to start to clean all the sensors starting with the oxygen sensor that runs into the section of exhaust I replaced and then the CAT sensors as they will have been starved of some exhaust fumes and may be unhappy. I wonder if anyone could give me any guidance on which sensor the fault is most likely coming from in light of the fact that I was running a blowing exhaust for a couple of months. I do appreciate the indicated fault may be unrelated but coincidence is convincing me otherwise.

Many thanks in advance.

T'was turbo boost sensor when mine refused to go above 3000rpm.

Thanks will add that to my list!

A diagnostic check will tell you.

Thanks, presumably this needs to be done at a FIAT dealer?

Most independents will have a code reader.

If you say whereabouts you live then maybe someone might recommend a place nearby

If you have a laptop multi_moo, you can download the software for free, and an adaptor/reader lead is only around a tenner . . .
FIAT OBD Cable

Alternatively a simple stand-alone code reader is around the same price.
OBD reader

Worth having if you're keeping your Multi for a while.