Real data-driven insights into which MOT failures affect UK drivers most.
1 in 3 vehicles fail MOT on first attempt
Every year, millions of UK vehicles undergo MOT testing. Our analysis of MOT trends reveals which defects are most common, which regions are affected, and what patterns emerge across vehicle types.
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Uneven braking force across wheels
Exhaust emissions exceed legal limits
Tyre tread below 1.6mm legal minimum
Non-functional headlights or brake lights
Worn suspension components
Excessive brake pad wear
Windscreen damage or obstruction
Active fuel leaking
Steering play or malfunction
Broken or missing mirrors
Urban driving, emissions focus
Road conditions, older vehicles
Mixed urban/motorway usage
Industrial emissions standards
Well-maintained vehicles
Rural vehicle patterns
Nearly new vehicles, high compliance
Early wear beginning
Significant component wear
Major wear and corrosion
Extensive deterioration
Brake & tyre issues (winter wear)
Emissions (winter fuel residue)
Emissions (summer catalytic stress)
Tyre tread & brake pad wear
Brake imbalance affects nearly 1 in 3 vehicles, making it the #1 MOT failure
Older vehicles (10+ years) fail MOT at nearly 50% rate vs. 8% for new vehicles
London has highest failure rate (38%), driven by stricter emissions standards
Seasonal patterns show winter months have highest failure rates
Emissions failures increasing as Euro standards tighten
For media inquiries: Contact press@motr.uk. All data available for editorial use with attribution.
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Last reviewed: July 2026 · Data from DVLA & DVSA · Editorial Policy
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