Lexus IS Headlights: Specs, Fitment & Common Faults

Bulb type, unit part numbers, and the faults that actually cause that flickering or dim light you've noticed.

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OEM Part Number: confirm via VIN — aftermarket LH TYC 20-17416-06-9 / RH Hella 1ZT 009 631-321

Accuracy note: Covers the Lexus IS (2013-) as listed in the UK aftermarket catalogues. Headlights are sold by side (passenger / nearside = LH, driver's / offside = RH on a UK car) and by lamp type — halogen, xenon (D1S / D3S) and LED or full-LED units are not interchangeable, and DRL, cornering and levelling options change the part number again. The references below are UK aftermarket catalogue listings for this generation, labelled by brand; genuine numbers are shown only where a listing quotes one. Check the lamp type and traffic side (UK right-hand-traffic units, not LHD) against your VIN, and expect xenon / LED and adaptive units to need levelling adjustment or coding after fitting.

Passenger side (LH / nearside) headlight — aftermarket	Prasco LS7024904 (LED, electric levelling motor); TYC 20-17416-06-9 (LED, electric levelling); Alkar 2743523 (LED, PY24W/H4 listed, motor); Alkar 2751283 (halogen H1/H7, W5W, electric motor); TYC 20-0390-05-2 (halogen H1/H7, electric motor); TYC 20-11778-05-2 (halogen H15/H7, electric)
Driver's side (RH / offside) headlight — aftermarket	Hella 1ZT 009 631-321 (bi-xenon D1S, PY21W, H11, with DRL function, dynamic bending light); Prasco LS7024903 (LED, electric levelling motor); TYC 20-17415-06-9 (LED, electric levelling); Alkar 2744523 (LED, motor); Alkar 2752283 (halogen H1/H7, W5W, electric motor); TYC 20-11777-05-2 (halogen H15/H7, electric)
Bulb types	dipped H7, main H1 (halogen units); H15 daytime running; H11 and D1S (bi-xenon); indicator PY21W or PY24W; sidelight W5W; H4 on basic units
Genuine (OE) numbers quoted	None quoted in catalogue listings — order genuine units against your VIN
Fitment notes	LED, bi-xenon and halogen units are all listed, with electric levelling on most; the bi-xenon unit is shown for the driver's side only. Some listed units carry other-vehicle tags, so verify fitment.

A Genuinely Important UK Rule Worth Knowing Before You Buy — Lexus IS Headlights

If your IS 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.

Lexus IS Headlights: Watch: Replacing It

🎬 Watch: How to change a headlight bulb on the Lexus IS 300h

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XE30 IS 300h headlight bulb change

Before you buy: matrix LED, adaptive, and cornering headlight systems often require electronic coding to the car after a unit swap, even for a genuine like-for-like replacement — a headlight that isn't recognised by the car's electronics can trigger warning lights or fail to auto-level correctly. Check whether your specific trim has one of these systems before assuming a straightforward bulb-in, bulb-out job.

Lexus IS Headlights: What It Does

On the Lexus IS, main and dipped beam bulbs — or LED/matrix modules on higher-spec cars — live inside the headlight unit, angled carefully to illuminate the road without blinding oncoming traffic. The daytime running light and front indicator often share that same housing too, adding complexity to both fitment and repair.

Lexus IS Headlights: Generations, Derivatives & Headlight Type

Standard trims	Halogen or Bi-LED (standard full LED with automatic high beam) depending on model year
F Sport	Genuine "Triple-Beam LED" option is offered on some Lexus models in this class — a distinctive three-projector design, more advanced than standard Bi-LED, though not necessarily standard equipment even on F Sport

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Lexus IS 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 Lexus Headlights

The same part, covered across other Lexus models.