Why is one headlight on and the other not working?

[VanKira]

The main reasons may be a blown fuse or a short circuit in the bulb. Here is more information about lighting faults: 1. Types of lighting faults: Automotive warning lights are generally divided into three categories: indicator, reminder, and warning. 2. Indicator: These lights indicate some basic conditions of the vehicle, showing its current working status, making it easier to understand various functions and states of the vehicle (e.g., lighting system indicator, coolant temperature indicator, fuel level indicator). 3. Reminder: These lights indicate that the vehicle's current state is abnormal or the operation is incorrect (e.g., seat belt reminder light, door open reminder light). 4. Warning: These lights indicate that the vehicle has a fault and requires repair (e.g., engine fault light, oil pressure light).