Mitsubishi Mirage G4 Back Up Light Bulb Size

The Mitsubishi Mirage G4 back up light utilizes bulb sizes 921, PY21W, P21W, and 1156 depending on the specific version of the vehicle. Available data covers the range from 2017 through 2024 for the listed components.

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

Bulb Size by Year Range

Years	Bulb Size
2024	921
2023	PY21W
2022	921
2017-2020	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ECE standard (Europe & worldwide). Single-filament amber bulb with BAU15s bayonet base. 12V, 21W.	PY21W
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Mitsubishi Mirage G4 back up light specifications reference three distinct bulb types across the listed model years: the 921, the PY21W, and the 1156.
The 921 is an ANSI-standard wedge bulb (T15) rated at 12V and 16W, used in the Mitsubishi Mirage G4 for the 2022 and 2024 model years.
The 1156 is an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 21W. It is specified for the 2017-2020 model years.
The PY21W follows the ECE standard, which governs vehicle lighting regulations in Europe and much of the world. It carries a BAU15s bayonet base and is rated at 12V and 21W, appearing in the 2023 model year.
The BA15s base of the 1156 and the BAU15s base of the PY21W are physically similar but not interchangeable. The BAU15s base has an offset pin alignment that prevents it from seating correctly in a BA15s socket.
The 921 wedge bulb uses a pinch-style base rather than a bayonet fitting, making it mechanically incompatible with the sockets designed for the 1156 or PY21W, despite all three operating at 12V.
The 1156 and PY21W share the same voltage and wattage ratings of 12V and 21W, but the PY21W is an amber-tinted bulb by design, whereas the 1156 produces a clear output, reflecting different regional regulatory requirements for reverse light color.
The 921 operates at 16W, which is 5W lower than both the 1156 and the PY21W. This difference in power draw is relevant when considering socket and wiring load compatibility across model years.