The Oldsmobile Achieva uses 9004 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production spanning 1992 to 1998.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9004 is a dual-filament halogen bulb, meaning a single unit contains two separate filaments that serve distinct functions within the headlight assembly.
Operating at 12 volts, the 9004 draws 65 watts on its high-beam filament and 45 watts on its low-beam filament, reflecting the greater luminous output required for high-beam operation.
The 9004 uses a P29t base, a three-contact connector that allows the vehicle's electrical system to activate either filament independently depending on the selected beam mode.
The 9004 conforms to ANSI standards recognized in both the United States and Canada, classifying it as a regulated halogen type within North American automotive lighting.
The Oldsmobile Achieva uses the 9004 bulb for both its high beam and low beam headlight positions across the full 1992-1998 model range, meaning a single bulb type serves both functions rather than requiring separate part numbers for each position.
Because the high beam and low beam positions share the same 9004 specification, the dual-filament design of the bulb is what allows the single housing to produce two distinct beam patterns without a separate dedicated bulb for each.
Substituting a single-filament bulb in place of the 9004 would result in the loss of one beam function, as the socket and wiring are designed to address two filaments within one unit.