hi, i have a 2001 2.5tdi t4. Today whilst driving back from leeds to highlands the tacho stopped working and the oil light bleeped then started flashing. i stopped the engine and now it will turn over fire and run for around a second then stop, the tacho still not working. i have got it on vag-com and its comming up with 2 error codes which reapear when cleared.
18058 powertrain databus missing message from instrument binnacle p1650 35 10
17978 engine start blocked by immobiliser p1570 35 00

i have removed the instroments, checked plugs, removed fuse box and done the same. having spent about 6hours so far does anyopne have any ideas of what else to check?
any help would be fantastic!