The Audi RS5 high beam and low beam headlight bulbs both utilize the D3S bulb size. The replacement chart covers vehicle production spanning 2013 to 2015.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
ECE standard (Europe & worldwide). Mercury-free HID (xenon) discharge bulb with PK32d-5 base and integral ignitor, for projector-type housings. 42V, 35W.
The D3S is an HID (high-intensity discharge) xenon bulb operating at 42 volts and 35 watts, built to ECE standards recognized across Europe and worldwide markets.
Unlike conventional halogen bulbs, the D3S produces light through a xenon gas discharge arc rather than a heated filament, which accounts for its higher operating voltage requirement.
The D3S incorporates an integral ignitor within the bulb assembly itself, meaning the ignitor and bulb are replaced as a single unit rather than as separate components.
The D3S uses a PK32d-5 base, a keyed connector format specific to HID projector-type housings that prevents substitution with physically incompatible bulb types.
The D3S formulation is mercury-free, distinguishing it from earlier HID standards such as the D2S, which contained mercury and carried corresponding disposal requirements.
In the Audi RS5 (2013-2015), the D3S serves both the high beam and low beam headlight positions, meaning a single bulb type covers both functions rather than requiring separate part numbers for each.
Because the D3S is designed exclusively for projector-type housings, it is not interchangeable with reflector-type housings, where its light distribution pattern would fall outside intended beam geometry.