2019 Audi A4 bulb fitment varies by headlight configuration. Models with HID headlights use D5S bulbs for both the low-beam and high-beam functions. Models equipped with LED headlights use LED units for both functions, so confirm the headlight type before ordering.
- Low beam: D5S with HID headlights; LED with LED headlights.
- High beam: D5S with HID headlights; LED with LED headlights.
- Front turn signal: 64132 with HID headlights; LED with LED headlights.
- Rear lighting: Reverse, brake, center stop, tail, and rear turn signal functions are LED.
- Additional exterior lighting: Daytime running, parking, cornering, license plate, and front and rear side-marker lights are LED.
- Interior lighting: Most listed interior locations use LED, while the glove box uses a 2821 bulb.
The supplied fitment data does not list a separate fog-light bulb for this model year. Verify whether your A4 has HID or LED headlights, especially when selecting replacement headlight or front turn-signal parts.