Why did the BMW 5 Series 520 suddenly turn off during normal driving?

What's the problem? Does everyone have the same problem? Does CAS just mean transmission failure or something? Cause of flameout during driving: 1. Unclean throttle will affect the intake air volume and mixing concentration. Cause low idle speed, idle speed jitter, refueling stop, heavy exhaust gas and so on. 2. The ignition of high-voltage bag and spark plug is damaged or weak, resulting in poor ignition or dead fire. It is recommended to disassemble and check whether the spark plug is not firm. 3, oil jam, fuel line pressure is normal, see whether the injector works normally, whether there is oil leakage jam, whether the gasoline filter is blocked. 4. The crankshaft position sensor is faulty, and the ECU can't detect the signal of the crankshaft position sensor, resulting in the failure to detect the ignition and fuel supply signals. Cause of sudden flameout circuit failure when the car is driving: This may be caused by low-voltage power failure and flameout during driving. At this time, you can mainly check the ignition and starter switches and fuse boxes. The short circuit of low voltage line leads to flameout, which is intermittent in this case. Check the low-voltage circuit of the car. @20 19