Mitsubishi Mirage G4 Brake Bulb Size

The Mitsubishi Mirage G4 brake light utilizes a P21/5W bulb size for illumination across all listed vehicle applications. Data for the specified component covers the period from 2017 through 2023.

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
2023	P21/5W
2017-2020	P21/5W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W

Other Locations

Additional Notes

The P21/5W is the brake bulb size across all listed years of the Mitsubishi Mirage G4, spanning the 2017-2020 and 2023 model years.
P21/5W is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope, one rated at 21 watts and the other at 5 watts.
The higher 21-watt filament typically serves the brake or stop light function, while the lower 5-watt filament serves a secondary function such as a tail or parking light.
The P21/5W uses a BAY15d bayonet base, which features two offset pins positioned at different heights on the base, a design that prevents incorrect insertion and ensures the correct filament aligns with the intended circuit.
This bulb operates on a 12-volt electrical system, which is standard for passenger vehicles.
The P21/5W is governed by ECE regulations, a standard recognized across Europe and many other markets worldwide, indicating a defined set of performance and safety requirements for the bulb.
The BAY15d base is not interchangeable with the BAY15s base, which is a single-filament variant with pins at equal heights. Substituting one for the other would result in incorrect fitment or circuit misalignment.