The 2018 BMW 420I has 47 electrical bulb & socket parts with verified fitment on this page — 10 part types and 4 brands, covering the 2.0L L4 Turbocharged engine. Each part includes a manufacturer part number and application notes.
The bulb and socket system on the 2018 BMW 420I covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination. The largest groups are Turn Signal Lamp Bulb (13 parts), Glove Box Light Bulb (9 parts) and Brake Light Bulb (5 parts). The other 7 part types cover the remaining 20 parts.
The 2018 BMW 420I 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 2018 BMW 420I, led by HELLA (14 parts), WAGNER (14 parts) and SYLVANIA (13 parts), plus 1 more brand. Quality grades include Standard Replacement, Extended Life and LED.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2018 BMW 420I. 8 parts have it, including HELLA H21W (Brake Light Bulb) and HELLA 2825 (Dome Light Bulb). Each part number opens a page with every vehicle that part fits.
Back Up / Reverse Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12177 | 🇲🇽 MX | 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.
This group shows a single part: PHILIPS 12177.
Brake Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 64136LL | 🇲🇽 MX | Long LifeBase Type: BAY9S | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular | H21W | 🇲🇽 MX | HalogenSocket Type Bulb: BAY9S | View on Amazon |
| PHILIPS | H21W | 🇲🇽 MX | View on Amazon | |
| SYLVANIA | 64136 | 🇲🇽 MX | View on Amazon | |
| WAGNER | 64136 | 🇲🇽 MX | 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.
5 Brake Light Bulb parts for the 2018 BMW 420I come from 4 brands — SYLVANIA, HELLA, PHILIPS and 1 other brand. The "Popular" part is HELLA H21W.
In the Extended Life grade, SYLVANIA supplies 1 part: grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. A representative part number is SYLVANIA 64136LL.
In the Standard Replacement grade, HELLA, PHILIPS, SYLVANIA and 1 other brand supply 4 parts: built to original-equipment specification. A representative part number is HELLA H21W.
This group includes HELLA H21W and SYLVANIA 64136LL and the remaining parts above.
Dome Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER | 17177LL | 🇲🇽 MX | Long LifeW2.1x9.5d Base | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER | T10LED | 🇲🇽 MX | Tru View PLUS LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular | 2825 | 🇲🇽 MX | IncandescentSocket Type Bulb: W2.1x9.5d | View on Amazon |
| HELLA | 2825BL | 🇲🇽 MX | IncandescentSocket Type Bulb: W2.1x9.5d | View on Amazon |
| WAGNER | 17177 | 🇲🇽 MX | W2.1x9.5d Base5.000 Watt | View on Amazon |
This table covers the bulbs in the dome 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.
5 Dome Light Bulb parts for the 2018 BMW 420I come from 2 brands — WAGNER and HELLA. The "Popular" part is HELLA 2825.
Extended Life: 1 part, from WAGNER. A representative part number is WAGNER 17177LL.
The LED (instant-on, long life, energy-saving) section lists 1 option from WAGNER — grouped under the catalog's "LED (instant-on, long life, energy-saving)" designation — the notes column spells out what sets them apart. WAGNER T10LED is listed in this group.
Standard Replacement: 3 parts, from HELLA and WAGNER. A representative part number is HELLA 2825.
Part numbers include HELLA 2825, WAGNER 17177LL and WAGNER T10LED, among others listed above.
Fog / Driving Lamp Bulb
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | H8LEDSP | 🇲🇽 MX | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular | 1235H8 | 🇲🇽 MX | Front | View on Amazon |
| HELLA | H8 | 🇲🇽 MX | HalogenSocket Type Bulb: PGJ19-1 | View on Amazon |
| PHILIPS | H8 | 🇲🇽 MX | Front | View on Amazon |
| SYLVANIA | H8 | 🇲🇽 MX | Base Type: PGJ19-1Wattage: 35.00 W | 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.
5 Fog / Driving Lamp Bulb parts are listed for the 2018 BMW 420I, from SYLVANIA, WAGNER, HELLA and 1 other brand. WAGNER 1235H8 carries the "Popular" badge.
LED (instant-on, long life, energy-saving): 1 part, from SYLVANIA. A representative part number is SYLVANIA H8LEDSP.
The Standard Replacement section: 4 options from WAGNER, HELLA, PHILIPS and 1 other brand. WAGNER 1235H8 is listed in this group.
This group includes WAGNER 1235H8, SYLVANIA H8LEDSP and HELLA H8 and the remaining parts above.
Glove Box Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 2825LL | 🇲🇽 MX | Long LifeBase Type: W2.1x9.5d | View on Amazon |
| WAGNER | 17177LL | 🇲🇽 MX | Long LifeW2.1x9.5d Base | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 2825ST | 🇲🇽 MX | BlueSilver Star | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 2825SL | 🇲🇽 MX | LEDCool White | View on Amazon |
| WAGNER | T10LED | 🇲🇽 MX | Tru View PLUS LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular | 2825 | 🇲🇽 MX | IncandescentSocket Type Bulb: W2.1x9.5d | View on Amazon |
| HELLA | 2825BL | 🇲🇽 MX | IncandescentSocket Type Bulb: W2.1x9.5d | View on Amazon |
| SYLVANIA | 2825 | 🇲🇽 MX | Base Type: W2.1x9.5dWattage: 5.00 W | View on Amazon |
| WAGNER | 17177 | 🇲🇽 MX | W2.1x9.5d Base5.000 Watt | 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.
9 Glove Box Light Bulb parts are listed for the 2018 BMW 420I, from SYLVANIA, WAGNER and HELLA. SYLVANIA 2825LL carries the "Popular" badge.
The Extended Life section: 2 options from SYLVANIA and WAGNER. SYLVANIA 2825LL is listed in this group.
The Extra Bright (improved visibility, but shorter life) section lists 1 option from SYLVANIA — grouped under the catalog's "Extra Bright (improved visibility, but shorter life)" designation — the notes column spells out what sets them apart. SYLVANIA 2825ST is listed in this group.
LED (instant-on, long life, energy-saving): 2 parts, from SYLVANIA and WAGNER. A representative part number is SYLVANIA 2825SL.
The Standard Replacement section: 4 options from HELLA, SYLVANIA and WAGNER. HELLA 2825 is listed in this group.
This group includes SYLVANIA 2825LL, WAGNER 17177LL and SYLVANIA 2825ST and the remaining parts above.
Headlamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | D1S | 🇲🇽 MX | High Beam and Low Beamwith HID Headlights | View on Amazon |
| SYLVANIA | D1SSZ | 🇲🇽 MX | Silver Star zXe | View on Amazon |
| WAGNER | D1S | 🇲🇽 MX | with Xenon Gas | 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 are listed for the 2018 BMW 420I, from SYLVANIA and WAGNER.
Part numbers include SYLVANIA D1S and SYLVANIA D1SSZ, among others listed above.
LED Bulb Adapter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER | CBH8H11H16 | 🇲🇽 MX | For H8 / H11 / H16 Bulb | View on Amazon |
This table covers the LED Bulb adapters.
One part is listed for the 2018 BMW 420I — WAGNER CBH8H11H16.
Tail Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 2825 | 🇲🇽 MX | IncandescentSocket Type Bulb: W2.1x9.5d | View on Amazon |
| HELLA | 7506 | 🇲🇽 MX | IncandescentSocket Type Bulb: BA15S | 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.
HELLA supplies both parts for the 2018 BMW 420I.
This group includes HELLA 2825 and HELLA 7506.
Turn Signal Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 7506LL | 🇲🇽 MX | Long LifeBase Type: BA15S | View on Amazon |
| WAGNER Popular | 17635LL | 🇲🇽 MX | Long LifeBA15S Base | View on Amazon |
| HELLA | 7506ALL | 🇲🇽 MX | IncandescentAmber | View on Amazon |
| HELLA | 7506LL | 🇲🇽 MX | IncandescentLong Life | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 7506ST | 🇲🇽 MX | Cool WhiteSilver Star | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 1156ALED | 🇲🇽 MX | Ultinon LEDAmber | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular | 7506 | 🇲🇽 MX | IncandescentSocket Type Bulb: BA15S | View on Amazon |
| HELLA | 7506A | 🇲🇽 MX | IncandescentBulb Diameter: 26.5 mm | View on Amazon |
| HELLA | 7506NA | 🇲🇽 MX | IncandescentNatural Amber | View on Amazon |
| PHILIPS | 12190NA | 🇲🇽 MX | Natural Amber | View on Amazon |
| SYLVANIA | 7506 | 🇲🇽 MX | Base Type: BA15SWattage: 25.00 W | View on Amazon |
| WAGNER | 17635 | 🇲🇽 MX | BA15S Base21.000 Watt | View on Amazon |
| WAGNER | 7506L | 🇲🇽 MX | Long LifeBulb Type: T-6 Bulb 3/4 (19mm) Diameter | 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.
13 Turn Signal Lamp Bulb parts for the 2018 BMW 420I come from 4 brands — HELLA, SYLVANIA, WAGNER and 1 other brand. The "Popular" part is SYLVANIA 7506LL.
Extended Life: 4 parts, from HELLA, SYLVANIA and WAGNER. A representative part number is SYLVANIA 7506LL.
Extra Bright (improved visibility, but shorter life): 1 part, from SYLVANIA. A representative part number is SYLVANIA 7506ST.
The LED (instant-on, long life, energy-saving) section: 1 option from PHILIPS. PHILIPS 1156ALED is listed in this group.
Standard Replacement: 7 parts, from HELLA, WAGNER, PHILIPS and 1 other brand. A representative part number is HELLA 7506.
Vanity Mirror / Sun Visor Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 12505LL | 🇲🇽 MX | Longer Life | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 2723 | 🇲🇽 MX | HalogenSocket Type Bulb: W2X4.6d | View on Amazon |
| WAGNER | 2723 | 🇲🇽 MX | W2X4.6d Base2.400 Watt | View on Amazon |
This table covers the replacement bulbs for the Vanity Mirror / Sun Visor Light. 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 Vanity Mirror / Sun Visor Light Bulb parts are listed for the 2018 BMW 420I, from PHILIPS, HELLA and WAGNER.
The Extended Life section: 1 option from PHILIPS. PHILIPS 12505LL is listed in this group.
The Standard Replacement section: 2 options from HELLA and WAGNER. HELLA 2723 is listed in this group.
This group includes PHILIPS 12505LL and HELLA 2723 and the remaining parts above.
Buying Electrical Bulb & Socket Parts for a 2018 BMW 420I
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: Turn Signal Lamp Bulb and Glove Box Light Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 2018 BMW 420I?
Our catalog currently lists 47 electrical bulb & socket parts for the 2018 BMW 420I across 10 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 2018 BMW 420I?
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 2018 BMW 420I 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 2018 BMW 420I?
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 2018 BMW 420I
Electrical Bulb & Socket Parts for Other BMW 420I 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.