If you’ve ever swapped the dull yellow halogen bulbs in your headlights for bright white LEDs, you probably know what happened at your next MOT: an instant fail. For years the rule was brutally simple — an LED bulb inside a housing built for halogen light was treated as an incompatible light source, and the car failed automatically.

That rule changed on 14 October 2026, and most drivers have no idea.

The DVSA published Special Notice 05-26 on 13 October 2026, updating section 4.1.4 of the MOT inspection manual. From 14 October, testers must accept ECE-approved LED replacement bulbs — the industry calls them LEDr bulbs — fitted in compatible halogen headlamps. It applies to MOT classes 3, 4, 5 and 7, which covers cars, taxis, minibuses, vans and tricycles. If your car is due its MOT this autumn and you’re running LED bulbs, this is the first time the tester is allowed to say yes.

But — and this is the part that will catch people out — the bulb alone doesn’t get you a pass. A sticker does.

The sticker that decides pass or fail

Every ECE-approved LEDr bulb comes in packaging that includes a secure, tamper-evident approval sticker from the manufacturer. Under the new rules, that sticker must be permanently fixed to the vehicle where the tester can see it easily — typically somewhere visible in the engine bay.

The sticker has to show the bulb category (for example, H11 LEDr), the variant, the rated voltage, the ECE approval number, the manufacturer’s name, and a security feature such as a hologram. The tester only has to check that the sticker is there. They don’t look up the approval number or check the manufacturer’s details against any database — the DVSA says so explicitly in the notice.

Here’s the trap: buy certified bulbs, throw the box away without sticking the label on the car, and you fail. A missing sticker, a sticker the tester can’t read, one that looks tampered with, or one that clearly doesn’t match the bulb fitted — all of these are recorded as a major defect, which means a fail. Plenty of drivers will fall into this exact hole in the coming months.

What still fails

The new rule is a narrow exception, not a free-for-all. These still fail exactly as before:

• HID/xenon conversions in halogen headlamps — not covered by the change at all.
• Full LED headlamp unit swaps — the rule is about bulbs in existing halogen housings, not replacement units.
• Motorbikes — classes 1 and 2 are explicitly excluded.
• Cheap unapproved LED kits — the ones sold online as “off-road use only” or with no ECE approval. No sticker, no pass.
• Bad beam pattern or aim — the headlamp still has to meet all the normal MOT requirements. An approved bulb in a badly aimed headlamp fails just like a halogen one would.

One more thing worth knowing: at the time of writing, only a small number of LEDr bulbs have actually gained ECE approval — the RAC reported that approved options were limited to certain H11 fog-light and C5W number-plate bulbs. The list will grow, but if you’re buying bulbs now, check the packaging says ECE-approved LEDr before you spend the money.

What to do before your MOT

1. Check the bulb packaging for ECE approval and the LEDr marking — keep the box until the sticker is on the car.
2. Fix the manufacturer’s approval sticker permanently where the tester can see it, and make sure it matches the bulb fitted.
3. Check your beam aim — an approved bulb with a dazzling or misaligned beam still fails.
4. If you’re unsure what class your vehicle is or when it’s due, check your full MOT history — it shows every past test, the mileage recorded, and any advisories.
5. Book at a local MOT centre and, if you’re budgeting, see what an MOT actually costs this year.

The bottom line: LED bulbs are no longer an automatic fail, but the paperwork — one small sticker — now matters more than the bulb itself.