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1) Overvoltage protection relay; if it was dead car would be stalling or would crank but not start at all.
2) Crankshaft sensor; very much the same , would crank but not start at all or engine would stall once started.
3) Starter motor pinion; would try to crank but make a loud screaching noise or not crank at all.
4) Fuel pump; car would normally still start but would lack performance or run very poorly and stall if fuel pump was very bad.
5) Alternator; if it wasn't charging you would be having battery problems, car would still run if jump started.
when are you going back to have the new IFZ and key fitted?
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You're good man! This saves me my confusion! I think by now we can narrow down the possibilities! Power supply is out of the question. The most possiblities would be between:
1. IFZ Control Module
2. CAN Bus Wiring Harness
3. HFM (that is the last resolution and i Hope not)
The new IFZ and key will be arriving middle of next week but the MB Dealer may gonna keep the car in the workshop for observations (I don't know how long). I was just wondering why would they need a new key coming along together with the new IFZ? Does it mean that my old keys cannot be used anymore after the installation of the new sets?