Ford Maverick Turn Signal Bulb Size

Ford Maverick front turn signal bulbs utilize 4257NA, 1157, or 1034NA sizes, while rear turn signal bulbs use WT21W or 1157 sizes depending on model configuration. The replacement chart covers vehicle production spanning 1970 to 2026 with corresponding bulb size specifications.

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

Front Turn Signal

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2022-2026	4257NA	PY27/7W	Check Price
1976-1977	1157	P21/5W	Check Price
1974-1975	1034NA	1034NA	Check Price
1970-1973	1157	P21/5W	Check Price

Rear Turn Signal

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2022-2026	WT21W	WT21W	Check Price
1970-1977	1157	P21/5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament wedge bulb, natural amber glass. 12V.	4257NA	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157	Check Price
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. Variant of 1157. 12V, 21/5W.	1034NA	Check Price
Ford OEM part. Single-filament wedge bulb (T20). Originally used in 2021+ Ford F-150, Bronco, and Maverick. 12V, 21W.	WT21W	Check Price

Other Locations

Additional Notes

The 1157 bulb is the most frequently specified type across the Ford Maverick turn signal data, covering both front and rear positions for the 1970-1973 and 1976-1977 model years. It follows the ANSI standard and uses a BAY15d bayonet base with a dual-filament configuration rated at 12V and 21W/5W.
The BAY15d bayonet base on the 1157 features offset pins, which physically prevent incorrect insertion and distinguish it from single-filament bayonet bulbs that share a similar base profile.
The 4257NA is specified for the front turn signal position on the Ford Maverick (2022-2026). It is a dual-filament wedge bulb with natural amber glass, operating at 12V under the ANSI standard.
The natural amber glass on the 4257NA produces an amber output without relying on a colored lens, which is a functional distinction from clear-glass bulbs used behind tinted or amber housings.
The 1034NA, specified for the front turn signal on the 1974-1975 Maverick, shares the BAY15d bayonet base and 12V/21W/5W rating with the 1157 but incorporates natural amber glass. It is classified as a variant of the 1157.
Because the 1034NA and 1157 share the same base type and voltage rating, the physical sockets are compatible, but substituting a clear-glass 1157 for the 1034NA would alter the color output at the lens.
The WT21W is specified for the rear turn signal on the Ford Maverick (2022-2026). Unlike the other bulbs in these specifications, it is a single-filament wedge bulb in the T20 form factor, rated at 12V and 21W, and is listed as a Ford OEM part rather than an ANSI-standard component.
The single-filament design of the WT21W means it serves only one lighting function per socket, in contrast to the dual-filament 1157 and 4257NA, which handle two functions such as turn signal and running light from a single bulb position.
The WT21W is noted as originally used in the 2021+ Ford F-150, Bronco, and Maverick, indicating a shared OEM fitment across multiple Ford platforms of that generation.
The front and rear turn signal positions on the 2022-2026 Maverick use different bulb types, the 4257NA at the front and the WT21W at the rear, and these two bulbs are not interchangeable due to differences in base type, filament count, and form factor.