Bentley Mulsanne Headlights Left Right 3Y1941018K 3Y1941017P

For the Bentley Mulsanne, the part numbers 3Y1941018K (Right) and 3Y1941017P (Left) refer to the main headlight assemblies for the 2017–2020 facelifted models.

These units are highly advanced, full-LED adaptive lamps that differ significantly from the earlier 2010–2016 Xenon/HID versions.

1. Technical Specifications

The 2017 facelift replaced the older Bi-Xenon technology with a sophisticated Full LED system.

• Adaptive Front-Lighting System (AFS): These lamps are “intelligent.” They use GPS data to adjust the light beam based on the road ahead (e.g., widening the beam for junctions or extending the reach for motorways).

• Matrix LED Technology: Allows for permanent high-beam usage by “cutting out” light around oncoming vehicles to avoid dazzling them.

• Design: The inner “jeweled” light contains the daytime running light (DRL) ring and the indicator, while the outer larger lamp handles the main driving beams.

• Finish: The internal bezels are typically finished in Bright Chrome, though “Dark Tint” versions exist for specific Blackline or Speed specifications.

2. Compatibility & “The Facelift”

These part numbers are strictly for the facelifted Mulsanne.

• Pre-2017 Models: If you are trying to fit these to a 2011–2016 car, they are not plug-and-play. The 2017+ headlights are slightly different in shape to accommodate the wider 2018-style bumper and hood.

• Electrical: The wiring harness for the LED units is completely different from the Xenon predecessors. A conversion requires new modules and significant coding via Bentley ODIS.

3. Installation & Modules

When purchasing these units, be aware they are often sold as “naked” shells. To be fully functional, they require:

1. LED Power Modules: Usually bolted to the bottom or rear of the housing.

2. Cornering/AFS Modules: Control the swivel motors.

3. Coding: Replacing a headlight on a Mulsanne requires “Basic Settings” calibration so the car knows the level point of the new beams.