What can cause a BMW to not start?

A BMW may not start for various reasons.

Weak fuel pump.
Engine temperature sensor / PCM Coolant Sensor.
Worn spark plugs.
Bad ignition coil.
Defective starter.
Electrical issues.
Damaged key.
Weak key fob battery.

How do I know if my starter is bad BMW?

Grinding noise. When the starter drive gear is worn out or not engaging properly, it will often produce a grinding noise.
Freewheeling.
Intermittent issues starting the vehicle.
Starter stays on after engine started.
Smoke.
Batteries.

Why does my BMW just click when I try to start it?

Registered. Like others have said, the clicking is from the battery not being strong enough to throw and hold the starter relay open. The clicking isn’t the battery, it’s from the relay snapping back and forth. 99.9% sure a new battery will solve this for you.

Why would my car suddenly not start?

Dead Battery – A dead battery is the most common reason your car won’t start. Because the battery controls your headlights and dashboard, if they turn on, but your engine won’t start, a bad ignition switch is the likely culprit.

Why does my BMW stop/start not work?

The wrong battery technology has been installed, which can only provide a small number of charging cycles. The outside temperature is too high or too low. If the battery needs too much power to supply the fan, the start-stop function is switched off. The engine temperature is too high or too low.

What do you do when your car won’t jump start?

If the car starts right away, your problem is most likely a dead battery. Charge the battery and clean the terminals and cable connectors to ensure good contact. If your car does not start by jump-starting, you may have a problem with your starter, alternator or another component of the electrical system.

How do I reset my BMW Immobiliser?

To reset the BMW e46 immobilizer, keep down the panic button on the FOB key for five seconds to reset the immobilizer. Then, push the lock button again, then sit ten feet away from the car for ten minutes.