An update:
Got time to pop the cylinder head cover off today and jot down the injector codes... they are all totally different.
Each one has the 5 letters and also a large single number on them too, not sure if that is supposed to correlate to which cylinder its in? if so number 5 would be at the front and has been changed ? ? ..
Reading from the back of the engine to the front:
1 NGBBA
2 NCLBA
3 LFGFA
4 NMNNA
1 NCLCC
Can anyone confirm what Ralph said, that the cylinder at the front of the car, on a Td5, is no.1? So that when I program them in its all on the right place.
I'm also curious as to how the codes ended up being all the same ... ? I wonder if it was a new ECU and that was the default? Any guesses?