The Isuzu Oasis high beam and low beam headlight bulbs both utilize a 9003 bulb size for optimal illumination. The replacement chart covers vehicle production spanning 1996 to 1999 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Isuzu Oasis uses the 9003 bulb size across both high beam and low beam headlight positions for the 1996-1999 model years.
The 9003 is an ANSI-standard halogen bulb recognized in the United States and Canada, operating on a 12-volt electrical system with a dual-filament design rated at 60 watts for high beam and 55 watts for low beam.
Because the Isuzu Oasis uses a single 9003 bulb to serve both the high and low beam functions, each headlight housing requires only one bulb per side rather than separate bulbs for each function.
The 9003 bulb uses a P43t base, which is a bayonet-style mount with a 43mm collar, and fitment depends on this base type matching the socket in the headlight housing.
The 9003 and H4 bulb types share the same dual-filament halogen construction and P43t base, making them functionally interchangeable in many applications, though the 9003 designation follows ANSI standards while H4 follows ECE standards used in other markets.