The Lincoln MKX side marker utilizes a 194 bulb size for illumination across the specific lighting components. Data for the specified vehicle covers the range from 2007 through 2010.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lincoln MKX uses two distinct bulb sizes for its side marker positions across the 2007-2010 model years: size 168 for the front and size 194 for the rear.
Both the 168 and 194 are ANSI-standardized bulb types recognized in the United States and Canada, meaning they conform to a defined set of electrical and physical specifications rather than being proprietary fitments.
Both bulbs share the T10 miniature wedge form factor, a small single-contact base that seats by friction rather than by a twist-lock or bayonet mechanism.
Both bulbs operate on a 12-volt circuit, consistent with standard automotive electrical systems.
Although the 168 and 194 share the same T10 wedge base, they are not interchangeable. The 168 draws 4.9 watts while the 194 draws 3.78 watts, and substituting one for the other would result in incorrect wattage for the intended socket.
The front side marker position on the Lincoln MKX (2007-2010) takes the higher-wattage 168 bulb, producing greater light output than the 194 used at the rear.
The rear side marker position uses the 194 bulb, which at 3.78 watts is the lower-wattage of the two T10 types specified for this vehicle.
The T10 wedge base is one of the most widely produced miniature bulb formats in automotive applications, and both the 168 and 194 are available from a broad range of lamp manufacturers under those ANSI designations.