If it's a wiring and/or electrical issue the error should include the cylinder number. Otherwise it's more likely to be a mechanical problem with the injector itself. I would be tempted to find a diesel specialist rather than paying main dealer prices. It's probably worth pursuing the wiring as the problem further (because the fix is cheap) before getting involved in changing injectors.
thanks, you're right...
So this morning i went out and got myself some heat shrink to re-do the injector 1 connector. After doing that to my satisfaction I fired her up to see if there was any change.. there wasn't. So i remembered someone mentioning to test each injector for its resistance. with my multi meter on its most sensitive setting all injectors return the same 0.06 reading.
So then i started to wonder where else this loose connection could be, disconnected the battery and removed the ecu connector and sprayed them with contact cleaner, re-fitted and tried again. this time no fault car runs as it should, so with the engine still running i go to the engine bay and fiddle with the wiring from injector 1 all the way back to the ECU. The engine runs fine untill i move or put slight pressure on the loom directly after the ECU connecting plug.
So, i have a loose connection in either the wiring to the ECU Plug or in the Plug - Socket connection itself.
I'm quite good with electronics so will tackle a re-wire myself. But i need a diagram of the ECU pin layout so i can figure out which pins/wires have the faulty connection.
Its not just Cyl 1 injector that is a symptom although that is the only reported error in MES but also the fuel guage drops to 0, ASR, ABS, Hill holder etc all become 'Unavailable' so i think there are multiple loose connections.
Thanks for the help, i appreciate your thoughts.