12 Electrical bulb & socket parts are listed for the 2021 Audi A4 Allroad, in 5 part types, covering the 2.0L L4 Turbocharged engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 Audi A4 Allroad, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination. Most of the listed parts are Headlamp Bulb (4 parts), Glove Box Light Bulb (3 parts) and Turn Signal Lamp Bulb (3 parts). The other 2 part types cover the remaining 2 parts.
The 2021 Audi A4 Allroad came with a single engine, the 2.0L L4 Turbocharged, and every part is verified against it.
4 brands supply electrical bulb & socket parts for the 2021 Audi A4 Allroad, led by PHILIPS (6 parts), SYLVANIA (4 parts) and ÜRO PARTS (1 part), plus 1 more brand. Quality grades include Standard Replacement, HID and Extended Life.
Each part number listed for the 2021 Audi A4 Allroad opens a page with every vehicle that part fits.
Brake Light Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 1156RLED | 🇺🇸 US 🇨🇦 CA | VisionLED | View on Amazon |
This table covers the bulbs in the stop lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
This group shows a single part: PHILIPS 1156RLED.
Fog / Driving Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | H21W | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the bulbs in the fog and driving lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
One part is listed for the 2021 Audi A4 Allroad — PHILIPS H21W.
Glove Box Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 2821LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: W2.1x9.5d | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12256 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| SYLVANIA | 2821 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the bulbs in the glove-box lamp. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
3 Glove Box Light Bulb parts are listed for the 2021 Audi A4 Allroad, from SYLVANIA and PHILIPS.
The Extended Life section lists 1 option from SYLVANIA — grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. SYLVANIA 2821LL is listed in this group.
The Standard Replacement section lists 2 options from PHILIPS and SYLVANIA — built to original-equipment specification. PHILIPS 12256 is listed in this group.
Part numbers include SYLVANIA 2821LL, PHILIPS 12256 and SYLVANIA 2821.
Headlamp Bulb
HID (intense white light)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | D5S | 🇺🇸 US 🇨🇦 CA | High Beam and Low Beamwith HID Headlights | View on Amazon |
| ÜRO PARTS | D5S | 🇺🇸 US 🇨🇦 CA | High Beam and Low BeamXenon (12V - 25W) | View on Amazon |
| WAGNER | D5S | 🇺🇸 US 🇨🇦 CA | High Beam and Low BeamHid Type | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | H8 | 🇺🇸 US 🇨🇦 CA | High Beam | View on Amazon |
This table covers the bulbs that light the headlamps. Typical signs include a dark lamp, a flicker over bumps, or a bulb that keeps failing on one side. Avoid touching a halogen capsule. Repeated failure in one socket is usually the socket or ground, not the bulb.
4 Headlamp Bulb parts are listed for the 2021 Audi A4 Allroad, from SYLVANIA, ÜRO PARTS, WAGNER and 1 other brand.
The HID (intense white light) section lists 3 options from SYLVANIA, ÜRO PARTS and WAGNER — grouped under the catalog's "HID (intense white light)" designation — the notes column spells out what sets them apart. SYLVANIA D5S is listed in this group.
The Standard Replacement section: 1 option from PHILIPS. PHILIPS H8 is listed in this group.
Part numbers include SYLVANIA D5S, among others listed above.
Turn Signal Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | PY21WLL | 🇺🇸 US 🇨🇦 CA | Longer LifeNatural Amber | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12174NA | 🇺🇸 US 🇨🇦 CA | Natural Amber | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | PWY24W | 🇺🇸 US 🇨🇦 CA | Frontwith HID Headlights | View on Amazon |
This table covers the bulbs in the turn-signal lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
3 Turn Signal Lamp Bulb parts for the 2021 Audi A4 Allroad come from 2 brands — PHILIPS and SYLVANIA.
Extended Life: 1 part, from PHILIPS. A representative part number is PHILIPS PY21WLL.
Standard Replacement: 1 part, from PHILIPS. A representative part number is PHILIPS 12174NA.
1 further part sits outside the graded sections, with the same engine-level match.
This group includes PHILIPS PY21WLL, PHILIPS 12174NA and SYLVANIA PWY24W.
Buying Electrical Bulb & Socket Parts for a 2021 Audi A4 Allroad
On this vehicle, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination.
- Confirm you have the 2.0L L4 Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Headlamp Bulb and Glove Box Light Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 2021 Audi A4 Allroad?
Our catalog currently lists 12 electrical bulb & socket parts for the 2021 Audi A4 Allroad across 5 subcategories and 4 brands, covering the 2.0L L4 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical bulb & socket problems on a 2021 Audi A4 Allroad?
Common symptoms include a lamp that flickers over bumps, melted or discolored socket plastic, or bulbs that keep failing early on one side. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Audi A4 Allroad was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Audi A4 Allroad?
Every part on this page is matched to the 2.0L L4 Turbocharged engine. Then repeated bulb failure in one position usually means a socket or ground problem, not bad bulbs — replace the socket rather than chase it. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Audi A4 Allroad
Electrical Bulb & Socket Parts for Other Audi A4 Allroad Years
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