Peugeot 604 License Plate Bulb Size

The Peugeot 604 license plate light requires a 12821 bulb size for proper installation and function within the rear lighting assembly. Available data for the specified vehicle covers the time range from 1977 through 1984.

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

Bulb Size by Year Range

Years	Bulb Size
1982-1984	12821
1977-1980	12821

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12821

Other Locations

Additional Notes

The Peugeot 604 uses the 12821 bulb across all listed model years from 1977 to 1984 for the license plate position, with the exception of 1981, which is not present in the specifications.
The 12821 is a Philips part number designating a miniature wedge bulb in the T10 form factor.
T10 refers to the bulb's tubular shape, with the number indicating a width of 10 millimeters.
The 12821 uses a W2.1x9.5d wedge base, a baseless design where the glass envelope itself is pinched to form the electrical contacts, eliminating the need for a separate metal base.
The W2.1x9.5d designation specifies a contact width of 2.1mm and a pin spread of 9.5mm, which are the physical parameters governing socket fitment.
The bulb operates at 12 volts and 5 watts, consistent with standard low-current automotive auxiliary lighting circuits.
At 5 watts on a 12-volt circuit, the 12821 draws approximately 0.42 amperes, placing it within the typical range for license plate illumination.
The W2.1x9.5d base type is widely used across many vehicle makes and model years, meaning the 12821 is a broadly interchangeable bulb rather than a model-specific component.