What to Do When a BMW Car Won't Start Due to Dead Battery?

[McCarter]

For diagnosing faults like engine failure to start, the first step is to check whether the battery is low on power. The timing belt slipping is the root cause of the failure where no electric spark is generated, leading to the engine's inability to start. For engine failure to start issues, the initial task is to inspect the electrical circuits in the engine starting system. Once the starting system's circuits are confirmed to be fault-free through testing, the next step is to examine the engine's ignition system. The diagnosis of the fuel system can be divided into two parts: the fuel supply system diagnosis and the fuel injector circuit system diagnosis.