Mercury Mountaineer License Plate Bulb Size

The Mercury Mountaineer license plate component requires a 168 bulb size for proper illumination and visibility on the rear exterior of the vehicle. Data provided for the specific bulb requirements covers the span from 1997 through 2010.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	US Type	EU Type	Shop
1997-2010	168	W5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.	W5W	Check Price

Other Locations

Additional Notes

The Mercury Mountaineer uses the 168 bulb size for the license plate position across the 1997-2010 model years.
The 168 bulb is classified as a T10 miniature wedge type, which refers to its wedge-shaped base that holds the bulb in place without a separate metal socket or locking mechanism.
The 168 bulb operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of auxiliary lighting positions such as license plate illumination.
The 168 designation follows ANSI standards recognized in both the United States and Canada, meaning the specification reflects a standardized bulb identity rather than a proprietary part number.
T10 wedge bulbs share a base width that is common across many miniature wedge applications, though wattage and voltage ratings can differ between specific ANSI numbers within the T10 family, making it relevant to match the 168 designation specifically rather than substituting by base size alone.