Know Your MOT

MOT failure rate and common problems for the Mercedes O-Class, and how to check your own car by registration.

Updated 05 September 2026.

14.8%fail rate

Mercedes O-Class MOT failure rate

What a Mercedes O-Class fails its MOT on, and the part that fixes each.

What it fails on, and why

Lamps & electrical11.1% 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.

Brakes11.1% 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.

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.

For the lamps & electrical failure: Mercedes O-Class headlight and indicator bulbsShop Mercedes O-Class headlight and indicator bulbs on AmazonaffiliateFind Mercedes O-Class headlight and indicator bulbs on eBayaffiliate
For the brakes failure: Mercedes O-Class brake pads and discsShop Mercedes O-Class brake pads and discs on AmazonaffiliateFind Mercedes O-Class brake pads and discs on eBayaffiliate

Other models

All Mercedes models MOT failure rates comparedRanked worst to bestMercedes C220 MOT failures28.8% failure rateMercedes Ml MOT failures21.9% failure rateFord Fiesta MOT failures27.1% failure rate

Questions and answers

What is the MOT failure rate of the Mercedes O-Class?

It fails 14.8% of its MOT tests across the DVSA record, from 61 tests.

What do these cars fail their MOT on most?

The most common failure area is lamps & electrical, at 11.1% of this model's failures.