I had a thought yesterday after speaking to the dealer again, the Steering Angle Sensor fault and the 4x4 system fault could both be assocaited to the battery change.

When I changed the battery on first start up afterwards I got (as expected) the 4x4 yellow light up which went once I had turned the steering from lock to lock. I knew to do this from a BMW mechanic who came out once when I ran the battery flat when I first had the car and from reading the threads on here about changing the battery.

When I rang the dealer to explain this (and the battery change was detailed in the letter I went through with the service manager and left in the car for the mechanic) the service manager had never heard of the need to turn the sterring to re-set the steering angle sensor.

They could have spent 1 hour on my time chasing a fault that doesn't exist!

All I need them to do if find out the reason for the fact that it will turn over but not start when the <Fuel Injection System> error come up.

Serious discussions needed I think.

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Oscar