BMW 428i will not start despite lights functioning normally on BMW 428i

Some BMW 428i owners report experiencing starting issues despite the lights functioning normally, often due to a faulty battery. These owners find that checking the battery voltage is crucial, as it should be around 12.4 volts or higher; lower readings may indicate a dead or dying battery. Additionally, when the vehicle won't start but other systems seem fine, some owners investigate the ignition system, including the key and key fob for damage, and test the starter motor for power and engagement. Other reported issues include blown fuses or broken relays, which can prevent the car from starting even when lights and radio operate normally; inspecting the fuse box for burnt fuses is recommended. Some owners also encounter problems with the immobilizer system, which may require testing and repair. Lastly, comprehensive electrical checks, including the battery, terminals, and alternator, are advised to pinpoint any underlying issues. If these problems persist, consulting a professional mechanic is often necessary for accurate diagnosis and resolution.