2019 Audi S4 Bulb Size

Misconception: swapping any bulb that fits feels fine — and that’s understandable. Think of it as guessing a key that looks similar; it might work temporarily, but fit, beam pattern, and heat handling can differ. The list here is a bulb size chart for the 2019 Audi S4, built to clear that confusion with a simple mental model of socket type, wattage, and recommended replacements. What is true is the chart helps you pick the correct part number and compatible options quickly, including LED and halogen alternatives. A rule of thumb: match socket type first, then compare brightness and heat specs. Quick recap — use the chart to avoid returns and glare, and to keep your car safe. Affiliate disclaimer: some links earn a small commission at no extra cost to you; I include them to cover upkeep and testing.