MOT Failure Rates 2026: The Five Components UK Drivers Should Pre-Check

The DVSA published the 2025 MOT statistics in March. The same five components fail the test year after year. Catching them at home in under 20 minutes saves you a re-test fee, a half day off work and the awkward conversation with your mechanic about why the headlight bulb has been out for two weeks.

About 30 percent of cars failed their MOT first time in 2025. The breakdown of failure causes:

• Lighting and signalling — 18.4 percent of all failures.
• Suspension — 13.1 percent.
• Brakes — 9.6 percent.
• Tyres — 7.9 percent.
• Driver visibility (washers, wipers, mirrors) — 7.2 percent.

These five categories account for over half of all MOT failures, and four of them you can pre-check with your hands and eyes.

This is the easiest fail to prevent and the most common one tested.

1. Park near a wall at night, switch on side lights, dipped beam, full beam in turn.
2. Walk around the car checking each bulb visibly lit. Include rear fog and rear reverse.
3. Test brake lights with someone pressing the pedal. Both stop lamps and the high-mounted brake light must function.
4. Number plate light is the single most common fail — easy to miss, easy to replace.

Legal tread depth is 1.6mm across the central three-quarters. The tester also looks for sidewall cracks, bulges and uneven wear.

• Use a 20 pence coin: insert into tread groove. If you can see the outer band of the coin, your tread is below 3mm — replace before MOT.
• Check sidewalls for cracks finer than a hair — a borderline pass becomes a fail at the inspection.
• Pressure must match the manufacturer's plate inside the door jamb.

You cannot fully test brake performance at home, but you can detect the obvious failures:

• Brake pedal travel — should not be soft or sink to the floor on hard press.
• Listen for grinding or squealing during normal use.
• Handbrake should hold the car on a moderate slope.
• Brake fluid should be clear amber — milky or dark fluid suggests moisture and likely fail.

The hardest of the five to pre-check, but two simple tests help:

1. Bounce test: press down hard on each corner. The car should rebound once and settle. More than two bounces suggests worn shock absorbers.
2. Visual: look behind each front wheel for damp residue on the strut — leaking dampers fail every time.

• From April 2026, software-defined headlamp adjustment must function correctly. If your matrix or adaptive LED system has been disabled by the dealer, that is a fail.
• Electric vehicles now have an explicit battery pack physical inspection: visible damage, mountings secure.
• Diesel particulate filter check is automated via OBD; previous loophole of removing the DPF physically and clearing the code stops working.

20 minutes of pre-MOT checks at home prevent the great majority of UK MOT failures. The repeat advice every year is the same: lights, tyres, wipers. If those three are right, you are already 35 percent less likely to fail on first attempt.

Last updated: May 2026. Statistics from DVSA 2025 MOT performance report.