2021 Audi A4 Bulb Size
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Bulbs Chart
2021 Audi A4 Headlight Bulb High Beam (D5S)
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Best Choice
POWERFUL LIGHT FROM XENON HID BULBS OFFER MAXIMUM SAFETY: Xenon HID (High Intensity Discharge) headlight bulbs offer twice as much light* for safer driving in all conditions while consuming 50% less power. The intense white light produced by the Xenon HID lamps is comparable to daylight. Studies have demonstrated that...
Philips D5S Standard Authentic Xenon
Xenon HID Conversion Kit
2021 Audi A4 Headlight Bulb Low Beam (D5S)
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Best Choice
POWERFUL LIGHT FROM XENON HID BULBS OFFER MAXIMUM SAFETY: Xenon HID (High Intensity Discharge) headlight bulbs offer twice as much light* for safer driving in all conditions while consuming 50% less power. The intense white light produced by the Xenon HID lamps is comparable to daylight. Studies have demonstrated that...Philips D5S Standard Authentic Xenon
Xenon HID Conversion Kit
2021 Audi A4 Headlight Bulb High Beam and Low Beam(with HID headlights) (D5S)
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Best Choice
POWERFUL LIGHT FROM XENON HID BULBS OFFER MAXIMUM SAFETY: Xenon HID (High Intensity Discharge) headlight bulbs offer twice as much light* for safer driving in all conditions while consuming 50% less power. The intense white light produced by the Xenon HID lamps is comparable to daylight. Studies have demonstrated that...Philips D5S Standard Authentic Xenon
Xenon HID Conversion Kit
2021 Audi A4 Cornering Light Bulb (H8 LED)
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#1 Bestseller
Prevents blinding on-coming vehicles: these light bulbs utilize the super high quality and most modern technology LED chips. This technology helps you get a LED array similar to the filament inside of an original halogen bulb. This creates a nice cut line on top of the beam. No pain in replacingSealight L2 Series
LED Lights
2021 Audi A4 Headlights
![ACANII - For [Halogen Model] 2006-2008 Audi A4 S4 Headlights Factory Style Headlamps Assembly Replacement Left+Right](https://m.media-amazon.com/images/I/51AHCsANfEL._AC_QL90_UL90_.jpg?ezimgfmt=0)
![ACANII - For 2006 2007 2008 Audi A4 S4 B7 [Halogen Model] Headlight Headlamp Assembly Replacement Right Passenger Side](https://m.media-amazon.com/images/I/51UZuaBV63L._AC_QL90_UL90_.jpg?ezimgfmt=0)
![ACANII - For [HID/Xenon Non-AFS Model] 2013-2016 Audi A4 S4 Factory Projedtor Headlight Headlamp Assembly Passenger Side](https://m.media-amazon.com/images/I/410va4ILlHL._AC_QL90_UL90_.jpg?ezimgfmt=0)
2021 Audi A4 Tail Lights
Audi A4 Bulb Size By Years
tl;dr: this bulb size chart lists correct lamp types for a 2021 Audi A4. Use it as a quick reference when replacing headlights, fog lights, or signal bulbs. Recommendation: match the chart to your vehicle trim and buy quality replacements to avoid fitment problems and inconsistent light output.
Impact: using the right size saves time and prevents electrical or mounting issues during installation. Risks: aftermarket LEDs can cause flicker, error codes, or reduced lifespan if not compatible — these are common gotchas. Next steps: verify against your owner’s manual, follow a simple checklist before purchase, and confirm socket fit. Affiliate disclaimer: some links are affiliate links; I may earn a small commission at no extra cost to you.
2021 Audi A4 specs
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