The Mazda 3 front inner turn signal uses 1157NA or 1034NA bulb sizes, front turn signal uses 1157NA or PY21W bulb sizes, and rear turn signal uses 7440 bulb size. The replacement chart covers 2004 to 2009 model 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.
The 1157NA is the most frequently specified bulb across the Mazda 3 turn signal positions covered in these specifications. It is an ANSI-standard dual-filament bulb rated at 12V with a 21W high filament and 5W low filament, fitted with a BAY15d bayonet base and natural amber glass.
The 1034NA, specified for the front inner turn signal on the 2004-2005 Mazda 3, is a variant of the 1157 sharing the same BAY15d bayonet base, dual-filament design, and 12V/21W/5W ratings, also with natural amber glass under the ANSI standard.
The 7440 is the sole bulb type listed for the rear turn signal across all model years in these specifications. It is a single-filament T20 wedge bulb rated at 12V and 21W under the ANSI standard.
The PY21W follows the ECE standard rather than the ANSI standard used by the other bulbs in these specifications. It is a single-filament amber bulb rated at 12V and 21W, but it uses a BAU15s bayonet base rather than the BAY15d base found on the 1157NA and 1034NA.
The BAU15s base of the PY21W and the BAY15d base of the 1157NA are not interchangeable. The offset pin positions differ between the two base types, meaning a PY21W cannot be substituted into a socket designed for the 1157NA or 1034NA.
The front turn signal on the 2006 Mazda 3 lists both the 1157NA and the PY21W as separate fitments, with the PY21W noted specifically for vehicles with manual leveling lights, indicating a trim-level or equipment-dependent distinction.
The 2004 front turn signal similarly carries dual fitment entries, with the PY21W listed under a discharge designation alongside the standard 1157NA, reflecting a configuration-specific application rather than a universal replacement.
The front inner turn signal position shifts from the 1034NA in 2004-2005 to the 1157NA in 2006, representing a change in specified bulb type between those model years for that particular position on the Mazda 3.
Although the 1157NA and 1034NA share the same base type and voltage and wattage ratings, they carry distinct ANSI part numbers and are listed separately in these specifications, indicating they are not treated as direct substitutes within the fitment data provided.
The wedge base of the 7440 is physically incompatible with the bayonet bases used by the 1157NA, 1034NA, and PY21W, making cross-position substitution between the rear turn signal and the front positions mechanically impractical.