Ford Taurus X Dome Light Bulb Size

The Ford Taurus X dome light requires a bulb size of 578 for the interior lighting system. Data for the specified bulb covers the range from 2008 to 2009.

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	Bulb Size
2008-2009	578

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578

Other Locations

Additional Notes

The 578 bulb is the sole dome light bulb size listed for the Ford Taurus X across the 2008-2009 model years.
The 578 is classified as a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
The 578 bulb follows the ANSI standard, which applies to both the United States and Canada, indicating a standardized specification recognized across North American markets.
At 41mm in length, the 578 bulb falls within the shorter range of festoon bulbs, which are commonly available in lengths from 28mm to over 50mm depending on application.
The 578 operates at 12 volts and 12 watts, which is consistent with standard automotive interior lighting powered directly from a vehicle's 12V electrical system.
Festoon bulbs are held in place by spring-loaded clips within the dome light housing, and the 41mm length of the 578 is a critical fitment factor, as installing a bulb of a different length may result in poor contact or failure to seat properly.