Toyota Prius 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 20-16496-06-2 / RH TYC 20-16495-06-2

Accuracy note: Covers the Toyota Prius (2016-) 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	TYC 20-16496-06-2 (LED, DRL, electric); TYC 20-17662-06-2 (LED, DRL, motor); Diederichs 6637183 (LED, DRL, motor, model year from 2019); Van Wezel 5460965 (LED, motor); Alkar 2749029 (LED, WY21W, motor); Abakus 212-11BHLMLDEM2 (LED, WY21W, motor)
Driver's side (RH / offside) headlight — aftermarket	TYC 20-16495-06-2 (LED, DRL, electric); TYC 20-17661-06-2 (LED, DRL, motor); Diederichs 6637182 (LED, DRL, motor, model year from 2019); Alkar 2750029 (LED, WY21W, motor); Abakus 212-11BHRMLDEM2 (LED, WY21W, motor); Johns 81 18 10-6 (halogen, motor)
Bulb types	LED units with WY21W indicator; halogen versions use H11/HB3 (Diederichs 6636181) or H4
Genuine (OE) numbers quoted	None quoted in catalogue listings — order genuine units against your VIN
Fitment notes	LED headlights are the main fitment for this Prius, with a few halogen H11/HB3 and H4 units also listed for lower-spec or earlier use.

A Genuinely Important UK Rule Worth Knowing Before You Buy — Toyota Prius Headlights

If your Prius 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.

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.

Toyota Prius Headlights: Watch: Replacing It

🎬 Watch: DIY 2010 2011 2012 2013 2014 2015 Toyota Prius Replacing Headlights (older gen)

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Gen 3 (XW30); no Gen 4 (2016-) bulb/unit video surfaced in 3 searches.

Toyota Prius Headlights: What It Does

On the Toyota Prius, 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.

Toyota Prius Headlights: Generations & Headlight Type

Standard trims	Halogen as standard, with LED daytime running lights integrated on many trims
Higher trims	LED headlights become available on higher trims and more recent generations, genuinely a different assembly from the halogen units on lower trims

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Toyota Prius 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 Toyota Headlights

The same part, covered across other Toyota models.