3156, 3157 & 4257

Diode Dynamics is proud to offer plug-and-play LED replacement turn signal bulbs for vehicles using 3156, 3157, and 4257-size bulbs! The 3156, 3157, and 4257-size bulb is used in both the front and rear turn signals of many modern vehicles, including Fords, Chevrolets, VWs, Acuras, Toyotas, and many more. With Diode Dynamics drop-in LED upgrades, you can choose from several brightness levels and colors to suit your vehicle!

The 4257 bulb differs from the 3156/3157 bulb slightly. The 3156/3157 bulb includes tabs on either side of the bulb, while the 4257 bulb does not. This allows the 4257 bulb to fit where the 3156/3157 bulb will not.

Not sure which bulb size you need? Click here for our Vehicle Finder tool!

3156 cross reference: 3456, 3156A, 3156, 3156AK, 3156ST, 3156K, 3156LL, 3456LL

3157 cross reference: 3155, 3457A, 3457NA, 4057, 3157A, 3057A, 3157, 3157NA, 5702A, 4157NA, 3057, 3454NA, 4157, 3047, 3357A, 3757A, 3457, 4114, 3357, 4114LL, 3457K, 3157LL, 4157K, 3057LL, 4157NAK, 3357LL, 4057LL, 3157K, 3357K, 3057K, 3057ALL, 3457AK, 3357ALL, 4114K, 3157X, 3057KLCP, 3757AK, 3047LL, 3057KX, 3157ST, 3057X, 4057K, 3457NAK, 3155LL, 3457ALL, 4157LL, 3157NAK, 3157AK, 3157NALL, 3047K, 3757ALL, 3157KX, 3057ST, 5702AK

4257: Fitment for Ford vehicles

Compatible replacements for 3156, 3157, and 4257-size incandescent bulbs.