Diode Dynamics 4257 HP24 Switchback Dual-Color Turn Signal LED Bulbs

Features

• True replacement for factory 4257-size incandescent front turn signal bulbs

• Custom-molded base connector for perfect fitment

• Adds cool white running light + amber turn signal functionality

• High-power Samsung LEDs arranged around the bulb

• No yellow tint when switched off for a clean, modern look

• Non-polar and CK compatible

• Plug-and-play installation in minutes

Overview

Upgrade your front turn signals with the Diode Dynamics 4257 HP24 Switchback LED Bulbs. Designed specifically for Ford vehicles, the 4257 HP24 features a custom-molded base connector, ensuring a true OEM replacement for 4257 bulbs. Unlike 3157 bulbs with side tabs, the 4257 design is unique and made to fit correctly without modification.

Populated with 16 amber chips and 8 white chips, these bulbs illuminate in a crisp 6000K cool white when headlights are on, then flash amber when signaling. Once the signal stops, they “switch back” to white, delivering a sleek, modern look while keeping full turn signal functionality.

Brightness & Reliability

• 410 Lumens – about 2x brighter than factory bulbs

• Constant-current circuitry prevents flickering

• Transient suppression for long-lasting performance

• Aluminum housing ensures efficient cooling and extended life

• Backed by Diode Dynamics’ 3-Year Replacement Warranty

What’s Included

• Quantity: Single Bulb or Pair

• Warranty: 3-Year Warranty

• Return Policy: 30-Day Return, No Restocking Fee, 100% Satisfaction Guarantee

Fitment

• Bulb Size: 4257

• Application: Front Turn Signal (clear reflector lens only)

• Vehicle Compatibility: Specifically designed for Ford vehicles using 4257 dual-filament bulbs

• Note: 4257 bulbs do not have side tabs like 3157 bulbs