Lincoln MKT high beam and low beam headlight bulbs both use the D3S size. The replacement chart covers 2010 to 2019 production years with corresponding bulb size specifications.
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 older HID designs, the D3S is mercury-free, which reflects a formulation change adopted to meet environmental regulations in various regions.
The D3S incorporates an integral ignitor directly within the bulb body, meaning the ignitor and bulb are replaced as a single unit rather than separately.
Its base type is PK32d-5, a keyed base configuration specific to the D3S family, which physically prevents substitution with electrically similar but mechanically incompatible HID types such as the D1S or D2S.
The D3S is designed exclusively for projector-type headlight housings, and use in reflector-type housings would produce incorrect light distribution.
In the Lincoln MKT (2010-2019), the D3S serves as both the high beam and low beam bulb, indicating the headlight system relies on a single bulb type per housing to perform both functions, likely through a projector with a movable shield or separate projector units.
Because the D3S uses a fixed PK32d-5 base with an integrated ignitor, it is not interchangeable with D3R bulbs despite sharing the same electrical ratings, as the R-suffix variant is intended for reflector housings and carries a coated envelope to control light scatter.