The tail lights on a 2010 Mazda3 typically use a 3157 dual-filament bulb for the tail and brake functions, plus a separate turn-signal bulb (commonly 7443) per side. Verify the exact sizes for your vehicle by checking the owner’s manual or the markings on the bulb socket.
In practice, the 2010 Mazda3 rear combination lamps house two bulbs per side: one dedicated to the tail light and braking, and one for the turn signal. Market and trim variations exist, so it’s wise to confirm the exact bulb type for your car before purchasing replacements. The reverse light usually has its own bulb (often 921 or 912), but this article focuses on tail light and turn signal bulbs.
Rear light bulb types by function
The following sizes cover the typical rear light setup in US-spec 2010 Mazda3 sedans and hatchbacks. Always verify with the owner’s manual or a parts lookup for your VIN.
- Tail light and brake light: 3157 dual-filament bulb. This single bulb provides both the tail and brake illumination.
- Turn signal: 7443 (amber in many markets) or 7440 in others. The exact bulb depends on regional production and model year.
Conclusion: In most 2010 Mazda3 rear lights, you’ll replace the tail/brake bulb with a 3157 and the turn signal bulb with a 7443 or 7440, depending on your market.
Market and trim considerations
European and other regional versions may use slightly different bulb numbers for the turn signal. If unsure, consult the owner’s manual, inspect the lens markings, or refer to a Mazda parts diagram for your VIN to ensure you buy the correct bulbs.
Replacement tips
When replacing bulbs, power down the vehicle and avoid touching the glass with bare fingers. Handle bulbs by the base to prevent oil contamination, and reseal the housing properly to maintain weatherproofing. If replacing with LEDs, ensure compatibility with the car’s electrical system and consider resistors to prevent bulb-out warnings.
Summary: For the 2010 Mazda3 tail lights, expect a 3157 dual-filament bulb for the tail/brake and a separate turn-signal bulb (typically 7443 or 7440) per side, with regional variations. Always verify exact sizes for your trim and market.