2020 Audi A4 Electrical Bulb & Socket Parts

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. Read more

5 Back Up / Reverse Lamp Bulb parts for the 2020 Audi A4 come from HELLA. The "Popular" part is HELLA 921.

In the Extended Life grade, HELLA supplies 2 parts: grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. A representative part number is HELLA 921LL.

In the Standard Replacement grade, HELLA supplies 3 parts: built to original-equipment specification. A representative part number is HELLA 921.

Listed part numbers: HELLA 921, HELLA 921LL and HELLA DE3175LL, plus the other parts above.

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. Read more

This group shows a single part: PHILIPS 1156RLED.

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. Read more

2 Fog / Driving Lamp Bulb parts are listed for the 2020 Audi A4, from HELLA and PHILIPS.

Listed part numbers: HELLA H21W, plus the other parts above.

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. Read more

3 Glove Box Light Bulb parts are listed for the 2020 Audi A4, from SYLVANIA and PHILIPS.

The Extended Life section: 1 option from SYLVANIA. SYLVANIA 2821LL is listed in this group.

The Standard Replacement section: 2 options from PHILIPS and SYLVANIA. PHILIPS 12256 is listed in this group.

Listed part numbers: SYLVANIA 2821LL, PHILIPS 12256 and SYLVANIA 2821.

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. Read more

5 Headlamp Bulb parts are listed for the 2020 Audi A4, from SYLVANIA, ÜRO PARTS, WAGNER and 2 other brands. PHILIPS H8 carries the "Popular" badge.

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: 2 options from PHILIPS and HELLA. PHILIPS H8 is listed in this group.

Part numbers include PHILIPS H8 and SYLVANIA D5S, among others listed above.

This table covers the sockets that hold a headlamp bulb in the housing. Typical signs include a flicker over bumps, melted plastic, or a bulb that will not stay seated. Dielectric grease on the contacts slows corrosion. Do not force a bulb into a heat-damaged socket. Read more

3 Headlamp Socket parts are listed for the 2020 Audi A4, from STANDARD MOTOR PRODUCTS and ACDELCO.

Listed part numbers: ACDELCO PT2298, STANDARD MOTOR PRODUCTS HP3835 and STANDARD MOTOR PRODUCTS S553.

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. Read more

5 Tail Lamp Bulb parts are listed for the 2020 Audi A4, from HELLA and PHILIPS. HELLA 921 carries the "Popular" badge.

The Extended Life section: 2 options from HELLA. HELLA 921LL is listed in this group.

In the LED (instant-on, long life, energy-saving) grade, PHILIPS supplies 1 part: grouped under the catalog's "LED (instant-on, long life, energy-saving)" designation — the notes column spells out what sets them apart. A representative part number is PHILIPS 1156RLED.

The Standard Replacement section: 2 options from HELLA. HELLA 921 is listed in this group.

This group includes HELLA 921, HELLA 921LL and HELLA 7506LL and the remaining parts above.

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. Read more

4 Turn Signal Lamp Bulb parts for the 2020 Audi A4 come from 3 brands — HELLA, PHILIPS and SYLVANIA.

Extended Life: 1 part, from PHILIPS. A representative part number is PHILIPS PY21WLL.

Standard Replacement: 1 part, from HELLA. A representative part number is HELLA 7507.

2 further parts sit outside the graded sections, with the same engine-level match.

This group includes PHILIPS PY21WLL, HELLA 7507 and HELLA PY21WTB and the remaining parts above.