Oldsmobile Alero Headlight Bulb Size

The Oldsmobile Alero uses 9005 bulbs for high beam headlights and 9006 bulbs for low beam headlights, with each size serving distinct lighting functions. The replacement chart covers vehicle production spanning 1999 to 2004, detailing bulb specifications across those years.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

High Beam Headlight

Years	US Type	EU Type	Shop
1999-2004	9005	HB3	Check Price

Low Beam Headlight

Years	US Type	EU Type	Shop
1999-2004	9006	HB4	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament halogen bulb with P20d base. 12V, 65W.	9005	Check Price
ANSI standard (US & Canada). Single-filament halogen bulb with P22d base. 12V, 55W.	9006	Check Price

Other Locations

Additional Notes

The Oldsmobile Alero uses the 9005 bulb for high beam headlights and the 9006 bulb for low beam headlights across its entire 1999-2004 production run.
Both the 9005 and 9006 are single-filament halogen bulbs operating on a 12-volt system, conforming to ANSI standards recognized in the United States and Canada.
The 9005 high beam bulb draws 65 watts, while the 9006 low beam bulb draws 55 watts, reflecting the lower power demand typical of low beam applications.
The 9005 uses a P20d base and the 9006 uses a P22d base, meaning the two bulbs are not physically interchangeable despite their otherwise similar construction.
Although the 9005 and 9006 share the same single-filament halogen design and voltage rating, the difference in base type serves as a mechanical safeguard against incorrect installation.