BMW 435i drivetrain issue with engine shutting off after starting despite new coils and spark plugs on BMW 435i

Some BMW 435i owners report experiencing drivetrain issues where the engine shuts off after starting, even with new coils and spark plugs installed. These owners often find that temporarily restarting the engine can sometimes clear a glitch that triggers the drivetrain malfunction warning. Additionally, they may discover visible problems such as loose wires, disconnected hoses, or fluid leaks that contribute to the issue. Some have identified faulty components, like a malfunctioning fan motor for the auxiliary coolant radiator, as potential culprits. Concerns about fuel quality also arise, with some owners opting to use premium fuel (91 octane) to see if the problem resolves. Timing chain failures, particularly in related models like the BMW 428i with the N20 engine, have been noted as a common issue affecting performance. Many owners recommend a thorough diagnostic process to accurately identify and address the drivetrain malfunction indicator and emphasize the importance of regular maintenance and timely replacement of components to prevent future problems.