The Volkswagen Passat brake light utilizes 7440, P21W, P21/4W, and P21/5W bulb sizes depending on the specific vehicle configuration. The provided data covers a range from 1990 through 2021.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Volkswagen Passat brake light specifications reference five distinct bulb types across its model history: 7440, P21W, P21/4W, P21/5W, and 12961.
The P21/5W is the most frequently recurring bulb type in these specifications, appearing across the 1990-1994 and 1998-1999 model years, as well as in the 2001 early model variant. It is a dual-filament ECE-standard bulb rated at 12V with a 21W primary filament and a 5W secondary filament, and it uses a BAY15d bayonet base.
The 7440 and P21W bulbs share identical electrical ratings of 12V and 21W, but they are not interchangeable. The 7440 follows the ANSI standard with a wedge-style T20 base, while the P21W follows the ECE standard with a BA15s bayonet base.
The Volkswagen Passat (2016-2021) with halogen capsule headlamps uses the 7440 bulb for the brake light function. This ANSI-standard single-filament wedge bulb is common in North American vehicle applications.
The P21/4W, used on the 2001-2005 Passat models (excluding the 2001 early model), is a dual-filament bulb with a BAZ15d bayonet base. Its base pin configuration differs from the BAY15d base of the P21/5W, making the two physically non-interchangeable despite their similar appearance.
The 2001 Passat carries two separate brake bulb specifications depending on production timing. The early model uses a P21/5W with a BAY15d base, while the standard 2001 model uses a P21/4W with a BAZ15d base, indicating a mid-year fitment change.
The center high mount stop light on the Volkswagen Passat for model years 1990-2001 (early model) consistently uses the 12961 bulb, a Philips-designated miniature wedge type rated at 12V and 5W. Its T10 form factor and W2.1x9.5d base place it in a significantly lower wattage category than the primary brake bulbs used on the same vehicles.
The P21W single-filament bulb with a BA15s bayonet base appears across non-consecutive model years: 1995-1997, 2000, and 2012-2015. Its single-filament design distinguishes it from the P21/4W and P21/5W, which both carry a secondary low-wattage filament for combined stop and tail light functions.
The dual-filament P21/4W and P21/5W bulbs differ in their secondary filament output, rated at 4W and 5W respectively. This difference, combined with their distinct base types, means the two are not substitutes for one another in fitment.
The ECE-standard bulbs (P21W, P21/4W, P21/5W) dominate the Passat brake light specifications across the 1990-2015 model years, reflecting the vehicle's European engineering origins. The shift to the ANSI-standard 7440 from 2016 onward corresponds to the North American market variant of the Passat produced at the Chattanooga, Tennessee assembly plant.