What is the reason for the left front turn signal not working on a BMW 535

[StMatthew]

BMW 535 left front turn signal not working reasons and solutions are as follows: Flasher relay damage: Purchase a matching flasher relay according to the vehicle model. Turn signal fuse blown: Carefully check the turn signal circuit for any short circuits, then replace the turn signal fuse. Turn signal switch failure: If the turn signal does not light up when pressing the movable contact or when the contact is closed, you can use a screwdriver to bridge the contact. If the light comes on, it indicates contact oxidation; if the turn signal still does not light up, the turn signal switch may be faulty. Use a screwdriver to connect the turn signal switch live wire to the left and right light wire terminals separately. If the light comes on, it means the turn signal switch is faulty and should be removed for repair or replacement.