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Welcome to the forum Mike.
sensor won't stop the engine from turning over on the starter,so I suspect Mick is spot on.
.The connection to the starter solenoid does have a tendency to corrode and cause the fault your having now.Also check all the earth wires between the battery and body/engine as these tend to corrode too.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo