Audi SQ5 front fog light uses H11 bulb size while rear fog light requires 921 bulb size for replacement. The chart covers 2014 to 2019 production 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 Audi SQ5 front fog lights for model years 2014-2018 use the H11 bulb, a single-filament halogen type operating at 12V and 55W with a PGJ19-2 base.
The H11 bulb follows the ECE standard, which governs lighting equipment across Europe and much of the world, though it also carries approval for use in the United States.
The PGJ19-2 base on the H11 is a keyed connector design, meaning only bulbs with that specific base configuration are physically compatible with the socket.
The Audi SQ5 rear fog lights for model years 2014-2019 use the 921 bulb, a wedge-type unit in the T15 form factor operating at 12V and 16W.
The 921 bulb follows the ANSI standard, which is the governing specification for automotive lighting in the United States and Canada.
The H11 and 921 bulbs are not interchangeable. They differ in base type, wattage, filament design, and the standards under which they are rated, placing them in entirely separate fitment categories.
The front fog light H11 operates at 55W, while the rear fog light 921 operates at 16W, reflecting the different luminous output requirements between front fog projection and rear fog visibility signaling.
The wedge base of the 921 bulb is held in place by tension from the socket itself rather than a locking collar or keyed connector, which is a characteristic of the T15 wedge form factor.