Subaru Baja Headlight Bulb Size

Additional Notes

• The Subaru Baja was offered in two distinct headlamp configurations across the 2003-2004 model years: a 2-headlamp system and a 4-headlamp system, each requiring a different set of bulb sizes.
• The 9007 bulb is a dual-filament halogen type, meaning a single bulb serves both high beam and low beam functions. In the 2-headlamp configuration of the Baja, the 9007 handles both roles simultaneously, which is why it appears under both the High Beam and Low Beam categories in the specifications.
• The 9007 operates on a 12V circuit and carries a wattage rating of 65W on the high beam filament and 55W on the low beam filament. It uses a PX29t base and conforms to the ANSI standard applicable in the United States and Canada.
• The 4-headlamp configuration splits high and low beam functions across separate dedicated bulbs. The 9005 handles high beam duties, while the H1 handles low beam duties in that system.
• The 9005 is a single-filament halogen bulb rated at 65W with a P20d base, operating at 12V under the ANSI standard. Because it carries only one filament, it is not interchangeable with the dual-filament 9007 despite sharing the same wattage on the high beam setting.
• The H1 is a single-filament halogen bulb rated at 55W with a P14.5s base, operating at 12V. It follows the ECE standard used in Europe and worldwide, though it also holds approval for use in the United States and Japan.
• The base types across these three bulbs are all physically distinct. The PX29t base of the 9007, the P20d base of the 9005, and the P14.5s base of the H1 are not interchangeable, making cross-substitution between these bulb types mechanically incompatible regardless of voltage or wattage similarities.
• Selecting the correct bulb for the Subaru Baja (2003-2004) requires confirming whether the vehicle was built with the 2-headlamp or 4-headlamp system, as the two configurations call for entirely different bulb types in both beam positions.