This page lists 10 electrical bulb & socket parts for the 2023 Audi A4, across 7 part types, covering the 2.0L L4 Turbocharged engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2023 Audi A4, 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 (3 parts), Fog / Driving Lamp Bulb (2 parts) and Back Up / Reverse Lamp Bulb (1 part). The other 4 part types cover the remaining 4 parts.
Every part on this page is matched to the 2.0L L4 Turbocharged — the only engine offered in the 2023 Audi A4.
The most listed brands for 2023 Audi A4 electrical bulb & socket parts are HELLA (5 parts), PHILIPS (4 parts) and WAGNER (1 part). Quality grades include Standard Replacement and HID.
Each part number listed for the 2023 Audi A4 opens a page with every vehicle that part fits.
Back Up / Reverse Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 921 | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: W2.1x9.5d | View on Amazon |
This table covers the bulbs in the reverse 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 2023 Audi A4 — HELLA 921.
Brake Light Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 921 | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: W2.1x9.5d | 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.
One part is listed for the 2023 Audi A4 — HELLA 921.
Fog / Driving Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | H21W | 🇺🇸 US 🇨🇦 CA | HalogenSocket Type Bulb: BAY9S | View on Amazon |
| PHILIPS | H21W | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Rearor | 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.
2 Fog / Driving Lamp Bulb parts for the 2023 Audi A4 come from 2 brands — HELLA and PHILIPS.
Part numbers include HELLA H21W, among others listed above.
Headlamp Bulb
HID (intense white light)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER | D5S | 🇺🇸 US 🇨🇦 CA | Low BeamHid Type | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 9006 | 🇺🇸 US 🇨🇦 CA | HalogenSocket Type Bulb: P22D or Socket Type Bulb: PG13 | View on Amazon |
| 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.
3 Headlamp Bulb parts for the 2023 Audi A4 come from 3 brands — WAGNER, HELLA and PHILIPS.
In the HID (intense white light) grade, WAGNER supplies 1 part: grouped under the catalog's "HID (intense white light)" designation — the notes column spells out what sets them apart. A representative part number is WAGNER D5S.
In the Standard Replacement grade, HELLA and PHILIPS supply 2 parts: built to original-equipment specification. A representative part number is HELLA 9006.
Listed part numbers: WAGNER D5S, HELLA 9006 and PHILIPS H8.
Parking Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12174NA | 🇲🇽 MX | Natural Amber | View on Amazon |
This table covers the bulbs in the parking 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 12174NA.
Tail Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 921 | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: W2.1x9.5d | View on Amazon |
This table covers the bulbs in the tail 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: HELLA 921.
Turn Signal Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12174NA | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Natural Amber | 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.
One part is listed for the 2023 Audi A4 — PHILIPS 12174NA.
Buying Electrical Bulb & Socket Parts for a 2023 Audi A4
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 Fog / Driving Lamp Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 2023 Audi A4?
Our catalog currently lists 10 electrical bulb & socket parts for the 2023 Audi A4 across 7 subcategories and 3 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 2023 Audi A4?
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 2023 Audi A4 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 2023 Audi A4?
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 2023 Audi A4
Electrical Bulb & Socket Parts for Other Audi A4 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.