Fuel Injection System Error

[UPGrayd]

Hey all, long time listener, first time caller.

We have a 2005 e53 diesel, I'm in love with it, however on the drive home today after putting some fresh tyres on it the car lost all power and flashed up with the inject. system error. Luckily we had enough momentum to cruise out of the way of traffic and pull over somewhere out of the way. I shut down the car completely and tried to start it again a few times with no luck (it would just crank away but not fire up).

A quick google later and I had accepted it was something i probably wasnt going to be able to resolve on the side of the road so I was going to have to call a tow truck. I thought "I'll give it one more shot before I do" and as I turned the key she fired back to life like nothing had happened. Drove about 10 minutes home without incident, then shut it off in my driveway. Tried to start it again about a minute later after opening my front gate and no luck, It would just sit there cranking over as if it had no fuel (not throwing any errors or anything).

10 minutes later the wife went out to move it and it fired up with no problem straight away.

Being so intermittent I imagine its going to be a nightmare to try and diagnose, so I'm wondering if anyone has experienced this behaviour and would be able to point me directly to the culprit to save me alot of time and hassle chasing ghosts around an engine bay.