MOT failure rate and common problems for the Triumph Twenty, and how to check your own car by registration.

Updated 05 September 2026.

7.4%fail rate

Triumph Twenty MOT failure rate

What a Triumph Twenty fails its MOT on, and the part that fixes each.

What it fails on, and why

Lamps & electrical25.8% of failures

Lighting is the single most common MOT failure and the cheapest to put right. A blown headlight, brake-light or number-plate bulb, a cracked lens, or a headlamp beam that points too high or low will all fail. Most are a two-minute bulb swap.

Brakes22.7% of failures

Brake failures cover worn pads and discs, an imbalance between wheels, corroded or scored discs, or a binding caliper. Braking efficiency is measured on a rolling road, so a spongy or pulling brake shows up as a low reading.

Other15.2% of failures

This covers a range of smaller items, from a non-working horn to a warning light left on.

Steering12.1% of failures

Steering faults are typically worn track-rod ends or ball joints, play in the rack, or a split gaiter letting grease out and dirt in. Excessive free play at the wheel fails.

Tyres10.6% of failures

Tyres fail for tread below the 1.6mm legal limit across the central three-quarters, uneven or exposed-cord wear, or sidewall damage. The tester inspects all four; a single illegal tyre is a fail.

Suspension6.1% of failures

Suspension failures usually mean a worn or snapped coil spring, a leaking shock absorber, or play in a lower arm ball joint or bush. The tester checks for corrosion, fractures and excessive movement. A broken front spring is one of the most common failures on higher-mileage cars and is a straightforward replacement.

The parts that fix each

If your car has just failed, you have 10 working days to fix the items and get a free partial retest. Confirm the exact fitment against your registration or VIN before buying.

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For the brakes failure: Triumph Twenty brake pads and discsShop Triumph Twenty brake pads and discs on Amazonaffiliate Find Triumph Twenty brake pads and discs on eBayaffiliate

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For the suspension failure: Triumph Twenty suspension springs and shock absorbersShop Triumph Twenty suspension springs and shock absorbers on Amazonaffiliate Find Triumph Twenty suspension springs and shock absorbers on eBayaffiliate

Other models

All Triumph models MOT failure rates comparedRanked worst to best Triumph Bonneville MOT failures9.8% failure rate Triumph Tiger MOT failures9.2% failure rate Ford Fiesta MOT failures27.1% failure rate

Questions and answers

What is the MOT failure rate of the Triumph Twenty?

It fails 7.4% of its MOT tests across the DVSA record, from 894 tests.

What do these cars fail their MOT on most?

The most common failure area is lamps & electrical, at 25.8% of this model's failures.