🚗 Product Information Interpretation
This is an LED control module for the left headlight of the Audi A1 (2011-2015 models), also known as the daytime running light / angel eye driver power board.
Packed included:1X Left side
- OEM part number: 8X0 907 472 
- PCB board number: 82A 998 473
- Compatible vehicles: Primarily used in the 2011-2015 Audi A1 (8X platform), and also compatible with some S1 models
- Function positioning: As the LED driver unit inside the headlight, it is responsible for controlling the lighting, brightness adjustment, and fault diagnosis of the daytime running lights (DRL) and angel eye halo.

 🔧 Core Functions
1.  LED driving: Provides a stable constant current power supply for the LED light source in the headlight, ensuring uniform brightness and reliable lifespan.
2.  Fault diagnosis: Monitors the status of the LED load. Once an abnormality such as an open circuit or short circuit occurs, it will feed a fault code back to the body control module (BCM).
3.  Bus communication: Interacts with other vehicle systems via LIN or CAN bus, responding to control commands such as light switch and automatic headlight.

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💡 Common Faults and Replacement Tips
- Typical faults: One side of the daytime running light / angel eye does not light up, flickers, has uneven brightness, or the instrument panel reports "Left headlight control unit fault".
- Key points for replacement:
- This module is exclusive to the left headlight, and the corresponding part number for the right side is usually different (e.g., 8X0 907 473). Confirm the left/right side when purchasing.
  - After replacement, some vehicles require coding or basic settings using a diagnostic tool (such as VCDS, ODIS) to clear fault codes and restore functions.