Mitsubishi Mirage G4 Turn Signal Bulb Size

Additional Notes

• The 1156 and 1156NA bulbs appear most frequently across the front turn signal positions of the Mitsubishi Mirage G4, covering the 2021-2024 model years. Both share the same BA15s single-contact bayonet base, 12V rating, and 21W output. The distinction between them is the glass envelope: the 1156NA uses natural amber-tinted glass to produce an amber signal without a colored lens, while the 1156 uses clear glass.
• The PY21W is the dominant rear turn signal bulb across the Mirage G4 lineup, specified for 2018 and 2021-2024. It is an ECE-standard single-filament amber bulb rated at 12V and 21W. Its base is a BAU15s bayonet, which is offset at a different angle than the BA15s base used by the ANSI 1156 family, making the two physically non-interchangeable despite sharing the same wattage.
• The front turn signal position on the 2019-2020 Mirage G4 uses the 1157NA, a dual-filament bulb with a BAY15d bayonet base rated at 12V with filaments at 21W and 5W. The BAY15d base has two offset pins to prevent incorrect single-filament bulbs from being seated in its place, so substitution with single-filament BA15s types is not physically possible without modification.
• The 1034NA, specified for the 2017-2018 front turn signal position, is described as a variant of the 1157 and shares the same dual-filament BAY15d base and 12V, 21/5W ratings. Despite the functional similarity to the 1157NA, the two carry separate ANSI designations, and their interchangeability in the Mirage G4 application is not confirmed by the specifications provided.
• The 12496 is a Philips/Osram proprietary part number rather than an ANSI or ECE standard designation. It is listed for the rear turn signal on the 2017 and 2019 Mirage G4. Its voltage is 12V, though its wattage is not specified in the provided data. Because it is identified as a specialty halogen application, direct substitution with standard-format bulbs warrants caution.
• The front and rear turn signal positions on the Mirage G4 do not share a common bulb type in any given model year, and the base types across positions differ substantially. The BA15s, BAY15d, and BAU15s bases each have distinct pin configurations, meaning cross-position substitution is not mechanically feasible.
• The ANSI-standard bulbs (1156, 1156NA, 1157NA, 1034NA) are designated for US and Canadian market applications, while the PY21W follows ECE standards used in European and worldwide markets. The presence of both standards across different model years of the same vehicle reflects regional regulatory differences in turn signal color and output requirements.
• Across the 2017-2024 front turn signal range, the Mirage G4 transitions through three distinct bulb types: the dual-filament 1034NA (2017-2018), the dual-filament 1157NA (2019-2020), and the single-filament 1156NA or 1156 (2021-2024). Each change involves a different base type, confirming that bulbs from earlier model years are not drop-in replacements for later ones.