Volkswagen Fox front turn signal bulbs utilize 1157NA and P21/5W sizes, while rear turn signal bulbs require P21W size. The replacement chart covers 1987 through 1993 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Volkswagen Fox front turn signal uses two distinct bulb types across its model years: the 1157 for 1987-1991 and the 1157NA for 1992-1993.
Both the 1157 and 1157NA are ANSI-standard dual-filament bulbs rated at 12V with a 21W main filament and a 5W secondary filament, sharing the BAY15d bayonet base.
The primary difference between the 1157 and 1157NA is the glass envelope. The 1157NA features natural amber-tinted glass, whereas the 1157 uses clear glass.
Because the 1157NA produces an amber light through its tinted glass rather than through an amber lens, substituting a standard 1157 in a 1992-1993 Fox front turn signal position may result in a different output color if the housing lens is clear.
The Volkswagen Fox rear turn signal uses the P21W bulb across all model years from 1987-1993.
The P21W is an ECE-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The BA15s base of the P21W and the BAY15d base of the 1157 and 1157NA are not interchangeable. The BAY15d base has two offset locating pins to enforce correct dual-filament orientation, while the BA15s base has two pins at the same height for a single-filament application.
The P21W carries a single filament, making it unsuitable as a direct replacement in any position that requires dual-filament operation.