What causes the failure of the left front turn signal on a BMW X1?

[StNova]

A burnt-out bulb or a blown fuse may cause the failure of the left front turn signal on a BMW X1. Specifically, check the following three aspects: Bulb, headlight control module, and related wiring. Solution: If you hear a ticking sound after turning on the left turn signal, it can be judged as a bulb failure; if there is no sound and the right turn signal and hazard lights do not work, it is likely a blown fuse or a faulty hazard switch. Finally, check the headlight module. If only one side fails, you can swap the left and right headlight modules to see if the failure transfers to the other side. If it does, then the issue is likely with the module itself. If not, carefully inspect the related wiring and connectors. If both sides fail, this is generally not a problem with the headlight module itself but should focus on the higher-level footwell module and the bus system.