Hi Norb, thank you so much for replying.
OK, will look at the flush. I think I’ve eliminated pretty much everything else. It’s had the adblue Injector done and I’ve just done injectors as was on limit on smoke test. Oil level not going down and no smoke so don’t think rings or anything.
With the ad blue filter, how can you release the air before removing it?
The MIL lamp seems to come on after being either washed or going through a wheel wash. Is there any wiring faults too that could bring this on?