I was driving this morning at low speed when suddenly the car dies out. I tried to restart the car with no luck. I had the car towed back home. The battery and starter are fine. I can hear the starter tried to crank up and fire the engine but it won't go.
Please help me diagnose the problem.

Fred

__________________
94 E320 Silver 210000 miles
94 740il Pewter Green 97000 miles- Retired
05 S430 4Matic
07 Lexus IS250

two possiblities spring to mind

since it happened suddenly-likely to electrical-fuel pump relay, also check distributor cap,also overvoltage protection relay.check all the fuses

2nd possiblity-fuel starvation-fuel pump failure.

Thanks Sunil. The fuel pump relay and overvoltage protection were replaced last year. I will check them tomorrow. I don't have dictributor cap and rotor on my car.
These are the other work done on my car previously.
1. Replaced cylinder head gasket (one month ago)
2. New wiring harness.
3. Valve job.
4. New mass air flow sensor.
5. New battery.
6. New fan belt.
Also, there is a code 4 stored in the diagnostic led read out.

Any help from the forum is appreciated.

Fred

__________________
94 E320 Silver 210000 miles
94 740il Pewter Green 97000 miles- Retired
05 S430 4Matic
07 Lexus IS250