Mazda 6 Turn Signal Bulb Size

Mazda 6 front and rear turn signal bulbs utilize 7444NA, 7443NA, 2357NA, 7440NA, 3757NA, and 7440 sizes depending on location and model configuration. The replacement chart covers 2003 through 2021 production years 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

Years	Bulb Size
2021	7444NA
2017	7444NA
2012-2016	7443NA
2011	7444NA
2009-2010	7443NA
2006-2008	2357NA
2003-2004	2357NA

Rear Turn Signal

Years	Bulb Size
2014-2017	7440NA
2009-2013	3757NA
2006-2008	7440
2003-2004	7440NA

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T20), natural amber glass. 12V, 21W/5W.	7444NA
ANSI standard (US & Canada). Dual-filament wedge bulb (T20), natural amber glass. 12V, 21W/5W.	7443NA
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. 12V, 26.9W/8W.	2357NA
ANSI standard (US & Canada). Single-filament wedge bulb (T20), natural amber glass. 12V, 21W.	7440NA
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V.	3757NA
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440

Other Locations

Additional Notes

The front turn signal positions on the Mazda 6 use three distinct bulb types across its model years: the 2357NA for 2003-2008, the 7443NA for 2009-2016, and the 7444NA for 2011, 2017, and 2021.
The 7443NA and 7444NA are both dual-filament T20 wedge bulbs rated at 12V with a 21W/5W power draw, and both carry the NA designation indicating natural amber glass conforming to ANSI standards for the US and Canada markets.
The 2357NA, used in the front turn signal position on earlier Mazda 6 model years, differs from the T20 wedge types in that it uses a BAY15d bayonet base rather than a wedge mount, and it draws more power at 12V, 26.9W/8W.
The NA suffix present on bulb designations such as 7443NA, 7444NA, 7440NA, 2357NA, and 3757NA indicates that the amber color is produced by the natural tint of the glass envelope itself rather than by a coating or lens filter.
The rear turn signal position on the Mazda 6 uses single-filament bulbs, while the front turn signal position uses dual-filament bulbs across all listed model years, reflecting the different functional demands of each position.
The 7440 and 7440NA are both single-filament T20 wedge bulbs rated at 12V, 21W, and share the same physical form factor. The 7440 lacks the NA amber glass designation, meaning its glass envelope is clear rather than naturally tinted amber.
The rear turn signal on the 2006-2008 Mazda 6 uses the 7440 without the NA suffix, while the 2003-2004 and 2009-2017 rear positions specify the 7440NA, indicating a difference in glass tint specification between those year groups despite the same base bulb type.
The 3757NA, used in the rear turn signal position for 2009-2013, is a dual-filament T25 wedge bulb rated at 12V with natural amber glass. The T25 envelope is physically larger than the T20 used in the 7440NA, making the two bulbs non-interchangeable despite both using a wedge base.
A fitment shift occurs at the 2014 rear turn signal position, where the specification changes from the dual-filament 3757NA to the single-filament 7440NA. Substituting one for the other would result in either a wattage mismatch or a filament count mismatch depending on the direction of the swap.
All bulb types listed across both the front and rear turn signal positions on the Mazda 6 conform to ANSI standards applicable to the US and Canadian markets.