Attached are the diagnosis procedures for the mentioned DME fault codes.

 

Thanks a lot !

 

 

So as promised, I started looking at the fix for this issue as car's off the road now and yeah, didn't take long to find the "likely" (not yet proven) cause of the problem :






Both sides knackered! But i'm giving it a full service, so will keep digging and see if I find anything else awry.

So Max Vehicles, maybe you want to look at your PCV lines (which I'm pretty sure these are, but happy to be corrected if wrong)