These MOT failure patterns show up more often on this registration year than on similar cars of the same class, age, and mileage.
Shares below are measured across the 2,600 of 2,609 failed first attempts (99.7%) that recorded an odometer reading in 2025 — the subset the age-and-mileage comparison can be computed on.
Standout: Electrical equipment — Horn — 11.2% of this year's failed first attempts
Recorded on 291 of those tests. It tops the table on elevation — about 5.4× more often than on similar cars of the same age and mileage. That is what makes it unusual for its class, which is a different question from what is most likely to fail; the buying checklist ranks by that. The full ranked list is in the table below.
| Fault pattern | Location | Failures | vs similar cars | Share of fails | Confidence |
|---|---|---|---|---|---|
|
Electrical equipment — Horn
Lamps, reflectors and electrical equipment > Electrical equipment > Horn
|
Any | 291 | ×5.4 | 11.2% | Strong |
|
Steering rack (front)
Steering > Steering gear > Steering rack
|
Front | 184 | ×4.0 | 7.1% | Likely |
|
Service brake performance
Brakes > Brake performance > Service Brake Efficiency (sp) > Rbt (sp) > Service brake performance
|
Any | 193 | ×3.3 | 7.4% | Likely |
| Diesel emissions test (pre-reg turbo rules before 01/07/2008) | Any | 165 | ×3.2 | 6.3% | Likely |
|
Flexible brake hoses (front)
Brakes > Flexible brake hoses
|
Front | 109 | ×2.6 | 4.2% | Possible |
|
Flexible brake hoses (rear)
Brakes > Flexible brake hoses
|
Rear | 75 | ×2.4 | 2.9% | Possible |
|
Integral vehicle structure condition (front)
Body, chassis, structure > Integral vehicle structure > Integral vehicle structure condition
|
Front | 102 | ×2.4 | 3.9% | Possible |
|
Ball joint dust cover (front)
Suspension > Suspension arms > Ball joint dust cover
|
Front | 118 | ×2.1 | 4.5% | Possible |
|
Emissions not tested
Noise, emissions and leaks > Exhaust emissions > Compression ignition > Emissions not tested
|
Any | 63 | ×2.1 | 2.4% | Possible |
Only patterns that clear minimum sample and elevation thresholds are shown (at least 20 failures and about 2.0× more often than similar cars).