The INFINITI G20 headlight bulb utilizes 9003 and 9004 size bulbs for both high beam and low beam applications. The replacement chart covers vehicle production spanning 1991 to 2002.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Infiniti G20 uses two distinct bulb types across its production run: the 9003 for 1999-2002 models and the 9004 for 1991-1996 models, with both types serving dual duty as high beam and low beam bulbs within their respective fitment years.
Both the 9003 and 9004 are ANSI-standard dual-filament halogen bulbs rated at 12 volts, meaning a single bulb housing contains two separate filaments to handle both beam functions rather than requiring individual bulbs for each.
The 9003 bulb, fitted to 1999-2002 G20 models, uses a P43t base and operates at 60W on the high beam filament and 55W on the low beam filament.
The 9004 bulb, fitted to 1991-1996 G20 models, uses a P29t base and operates at 65W on the high beam filament and 45W on the low beam filament, reflecting a notably wider wattage gap between its two filaments compared to the 9003.
The P43t and P29t base types are physically incompatible with each other, meaning a 9003 bulb cannot be seated in a socket designed for a 9004, and vice versa, despite both being dual-filament halogen types.
Although the 9003 and HB2 designations refer to the same bulb, the ANSI 9003 designation applies specifically within the United States and Canada, which is the standard reflected in these specifications.