BMW 4 Series Headlights: Specs, Fitment & Common Faults
Bulb type, unit part numbers, and the faults that actually cause that flickering or dim light you've noticed.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — aftermarket LH TYC 20-9774-26-9 / RH TYC 20-9773-26-9
| Passenger side (LH / nearside) headlight — aftermarket | TYC 20-9774-26-9 (xenon D1S with LED, DRL, electric); Van Wezel 0624981 (xenon D1S, LED, automatic levelling, not facelift); Magneti Marelli 711451000040 (bi-xenon D1S, PWY24W, bulbs not included); Magneti Marelli 711451000046 (bi-xenon, dynamic bending); Van Wezel 0624961 (LED, adaptive front lighting, not facelift); Prasco BM4044924 (LED, DRL, motor) |
|---|---|
| Driver's side (RH / offside) headlight — aftermarket | TYC 20-9773-26-9 (xenon D1S with LED, DRL, electric); Van Wezel 0624982 (xenon D1S, LED, automatic levelling, not facelift); Magneti Marelli 711451000041 (bi-xenon D1S, PWY24W); Magneti Marelli 711451000047 (bi-xenon, dynamic bending); Van Wezel 0624962 (LED, adaptive front lighting, not facelift); Prasco BM0314903 (halogen H7/H7, motor) |
| Bulb types | xenon D1S, indicator PWY24W, halogen H7/H7 (Prasco only); sockets Pk32d-2 and W2.1x9.5d on Van Wezel units |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine units against your VIN |
| Fitment notes | Mostly D1S xenon / bi-xenon and LED adaptive units; halogen is rare (Prasco BM0314903 right, paired BM0314904); several units are "not for facelift" and Diederichs/Magneti Marelli xenon units exclude the DRL control unit. |
A Genuinely Important UK Rule Worth Knowing Before You Buy — BMW 4 Series Headlights
If your 4 Series has factory-fitted halogen headlamp housings, converting them to fit LED bulbs is treated as a definite MOT failure under the current inspection manual — this isn't a grey area or a minor advisory, since a housing designed for halogen doesn't distribute an LED bulb's light output correctly, which can genuinely dazzle oncoming drivers. If you want a genuine LED upgrade, the correct route is a complete headlight unit designed for LED from the factory, not a bulb swap into an existing halogen housing.
BMW 4 Series Headlights: Watch: Replacing It
F32 in title
BMW 4 Series Headlights: What It Does
On the BMW 4 Series, the main and dipped beams, whether conventional bulbs or LED/matrix modules on higher trims, sit inside the headlight unit at an angle calculated to illuminate the road without dazzling other drivers. Many modern units also combine the daytime running light and indicator into that same housing, adding a layer of complexity to both part numbers and repairs.
BMW 4 Series Headlights: Generations, Derivatives & Headlight Type
| Entry-level trims | Halogen main headlight paired with LED daytime running lights — the DRL function is LED even when the main beam isn't |
|---|---|
| Mid trims | Standard LED — a simple LED projector per headlight with no adaptive function, meaning the beam doesn't respond to speed, road shape, or oncoming traffic |
| Higher trims/M Sport | Adaptive LED with BMW Selective Beam anti-dazzle high-beam function becomes available, genuinely different from standard LED in that it actively adjusts to road conditions and oncoming traffic |
| Top-tier option | Laser Light is offered as BMW's top headlight technology on some models in this range, though availability is more limited than on larger BMW models |
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BMW 4 Series Headlights: Common Faults, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Headlights Guide for the four bulb technologies and how they differ, UK law on aim and modifications, common faults to check for, how difficult this job is to DIY, and confirming fitment against your VIN.
More BMW Headlights
The same part, covered across other BMW models.