Audi 5000 Headlight Bulb Size

The Audi 5000 high beam and low beam headlight bulb sizes include 9004, H4651, H5001 for high beam applications and 9004, H4656, H5006 for low beam applications, with bulb size specifications varying across production years. The replacement chart covers 1978 through 1987 model years with corresponding bulb size data.

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

High Beam Headlight

Years	Bulb Size
1986-1987	9004
1980-1985	H4651
1978-1979	H5001

Low Beam Headlight

Years	Bulb Size
1986-1987	9004
1980-1985	H4656
1978-1979	H5006

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament halogen bulb with P29t base. 12V, 65W/45W.	9004
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651
ANSI standard (US & Canada). 4-inch square sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5001
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656
ANSI standard (US & Canada). 5.75-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5006

Other Locations

Additional Notes

The Audi 5000 headlight specifications span the 1978-1987 model years and involve four distinct bulb types across high and low beam positions: H5001, H5006, H4651, H4656, and 9004.
The 9004 is a dual-filament halogen bulb rated at 12V with a 65W high beam filament and a 45W low beam filament, fitted with a P29t base. Its dual-filament design means a single 9004 unit serves both high and low beam functions within one housing.
For the 1986-1987 Audi 5000, the 9004 bulb is specified for both the high beam and low beam positions, reflecting its dual-filament capability in a single socket.
The H4651 and H4656 are both 4x6-inch rectangular sealed beam units operating at 12V. The H4651 is designated for high beam use and the H4656 for low beam use on the 1980-1985 model years. Because sealed beam units integrate the lens, reflector, and filament into one assembly, the entire unit requires replacement rather than just the bulb.
The H5001 and H5006 are sealed beam units specified for the 1978-1979 model years. The H5001 is a 4-inch square unit used for high beam, while the H5006 is a 5.75-inch round unit used for low beam. Both operate at 12V and are also full-assembly replacements.
All bulb types listed across the Audi 5000 specifications conform to ANSI standards applicable in the United States and Canada, indicating regulatory compliance for those markets.
The transition from sealed beam units to the 9004 halogen bulb between the 1985 and 1986 model years represents a change in headlight technology type, from fixed sealed assemblies to a replaceable-bulb format with a discrete socket base.
The H4651 and H4656 share the same physical sealed beam format and size, but they are not interchangeable, as each is rated and designated for a specific beam function, high or low respectively.