Hi Thanks for the replies, the fault code terminology is off the bosch but yes agree they are misfire codes. We have looked further on Saturday and found oil entering no 4 cylinder bore, it also looks like its got lots of history as gearbox been replaced, and has had sump off whether for a oil leak or whatever but they cut the cat to lower the sump then welded up again after repairs and ECU wiring has been pulled about a bit so looking like it has had some issues along the way
It turns out customer has only had car for 3 weeks
and the garage who sold it are coming to get it. so we might not see the fix as its very intermittent