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 2,641 of 2,643 failed first attempts (99.9%) that recorded an odometer reading in 2025 — the subset the age-and-mileage comparison can be computed on.
Standout: Electrical equipment — Horn — 10.6% of this year's failed first attempts
Recorded on 280 of those tests. It tops the table on elevation — about 5.6× 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 | 280 | ×5.6 | 10.6% | Strong |
|
Steering rack (front)
Steering > Steering gear > Steering rack
|
Front | 159 | ×3.9 | 6.0% | Likely |
|
Service brake performance
Brakes > Brake performance > Service Brake Efficiency (sp) > Rbt (sp) > Service brake performance
|
Any | 159 | ×2.9 | 6.0% | Possible |
|
Ball joint dust cover (front)
Suspension > Suspension arms > Ball joint dust cover
|
Front | 176 | ×2.7 | 6.7% | Possible |
|
Linkage pins and bushes (front)
Suspension > Anti-roll bars > Linkage pins and bushes
|
Front | 83 | ×2.5 | 3.1% | Possible |
|
Rear fog lamp
Lamps, reflectors and electrical equipment > Front and rear fog lamps > Rear fog lamp > Rear fog lamp
|
Any | 190 | ×2.4 | 7.2% | Possible |
|
Flexible brake hoses (front)
Brakes > Flexible brake hoses
|
Front | 109 | ×2.3 | 4.1% | Possible |
| Diesel emissions test (pre-reg turbo rules before 01/07/2008) | Any | 152 | ×2.2 | 5.8% | Possible |
|
Emissions not tested
Noise, emissions and leaks > Exhaust emissions > Compression ignition > Emissions not tested
|
Any | 69 | ×2.2 | 2.6% | Possible |
|
Flexible brake hoses (rear)
Brakes > Flexible brake hoses
|
Rear | 73 | ×2.1 | 2.8% | 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).