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 605 failed first attempts in 2025 that the age-and-mileage comparison can be computed on.
Standout: Ball joint dust cover (front) — 31.1% of this year's failed first attempts
Recorded on 188 of those tests. It tops the table on elevation — about 17× more often than on similar cars of the same age and mileage. On this year it is also the commonest failure, so it answers both questions at once. 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 | 59 | ×20 | 9.8% | Likely |
|
Ball joint dust cover (front)
Suspension > Suspension arms > Ball joint dust cover
|
Front | 188 | ×17 | 31.1% | Strong |
|
Rigid brake pipes (rear)
Brakes > Rigid brake pipes
|
Rear | 41 | ×16 | 6.8% | Likely |
|
Rbt (sp)
Brakes > Brake performance > Parking brake efficiency (sp) > Rbt (sp)
|
Any | 32 | ×2.6 | 5.3% | Possible |
|
Registration plate lamp(s)
Lamps, reflectors and electrical equipment > Registration plate lamp(s)
|
Any | 20 | ×2.0 | 3.3% | 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).