Ford Expedition front and rear side marker bulbs utilize 194 size for front applications and 3057, 3157, or 4157 sizes for rear positions, with 168 and 194 sizes available for general side marker installations. The replacement chart covers 1997 through 2023 model years with corresponding bulb size specifications for each production period.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford Expedition front side marker uses the 194 bulb across all listed model years from 1997 to 2014, making it the most consistently specified bulb in these fitment records.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, classified under the ANSI standard applicable to the US and Canada.
The rear side marker position draws from three different dual-filament bulb types across its listed years: the 4157, 3157, and 3057, depending on the model year.
The 3057, 3157, and 4157 are all T25 dual-filament wedge bulbs sharing identical voltage and wattage ratings of 12V with a 27W high filament and 7W low filament, yet they are distinct part numbers and are not interchangeable without confirming socket compatibility.
The Ford Expedition (2007-2012) rear side marker specifies either the 4157 or 3157 depending on the exact year, so substituting one for the other without verifying the socket type risks an improper fit.
The rear side marker shifted from the 3157 to the 3057 between the 2018 and 2021 model years, representing a bulb number change despite both sharing the same T25 form factor and wattage ratings.
The 168 bulb is specified exclusively for mirror-mounted side marker positions on the 2004-2006 Expedition, and it is a T10 miniature wedge type rated at 12V and 4.9W.
Although the 168 and 194 share the same T10 wedge form factor, their wattage ratings differ at 4.9W and 3.78W respectively, which is a relevant distinction for mirror-position fitments where the 168 is specified.
The 2003 Expedition mirror side marker position specifies the 194 rather than the 168 used in surrounding years, indicating that the same mirror position did not carry a uniform bulb specification across all early-2000s model years.
The 2006 Expedition rear side marker carries two separate entries: a 194 for the standard position and a 168 for the mirror position, indicating that two distinct bulbs serve the rear side marker function on that model year.