Volkswagen Jetta License Plate Bulb Size

Additional Notes

• The Volkswagen Jetta license plate position uses three distinct bulb types across its model history: the DE3423 festoon, the 12961 miniature wedge, and the 3893 bayonet bulb.
• The DE3423 is an ANSI-standardized festoon bulb with a 41mm length and end-cap contacts, operating at 12V. Its festoon form factor means it seats by pressing lengthwise between two spring-clip holders rather than inserting into a socket.
• The 12961 carries a Philips part number and is a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W. The wedge base relies on the bulb's glass envelope and wire leads to create contact, with no separate metal base required.
• The 3893 is an ANSI-standardized bulb with a BAY15d bayonet base, noted as a specialty application. The BAY15d base features two offset pins and two filaments, which is atypical for a single-function license plate position.
• The DE3423 festoon type is specified for the Volkswagen Jetta across the 2000-2009 model years, with the exception that 2005 carries no entry in these specifications.
• The 12961 wedge bulb is specified for the 1985-1998 model years, along with the early production variant of the 1999 model year.
• The 1999 Volkswagen Jetta carries a split specification: the 12961 applies to standard production units, while the DE3423 applies to the late model variant. These two bulbs are not interchangeable due to their different base types and physical form factors.
• The 3893 bayonet bulb is specified for the 1980-1984 model years, making it the earliest bulb type in this fitment record.
• The three bulb types each use a different mounting system, meaning no cross-substitution is possible between the festoon end-cap, the wedge base, and the bayonet base without a corresponding change in the housing socket.