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 1,157 of 1,158 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 — 13.1% of this year's failed first attempts
Recorded on 151 of those tests. It tops the table on elevation — about 9.2× 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 | 151 | ×9.2 | 13.1% | Strong |
|
Seat belts — Condition (front)
Seat belts and supplementary restraint systems > Seat belts > Condition
|
Front | 25 | ×5.7 | 2.2% | Possible |
|
Steering rack (front)
Steering > Steering gear > Steering rack
|
Front | 34 | ×5.4 | 2.9% | Likely |
| Diesel emissions test (compression-ignition rules for vehicles from 01/07/2008) | Any | 42 | ×2.9 | 3.6% | Possible |
| Diesel emissions test (pre-reg turbo rules before 01/07/2008) | Any | 30 | ×2.5 | 2.6% | Possible |
|
Wheel bearings (front)
Suspension > Wheel bearings
|
Front | 38 | ×2.4 | 3.3% | Possible |
|
Individual direction indicators (front)
Lamps, reflectors and electrical equipment > Direction indicators > Flashing type > Individual direction indicators
|
Front | 28 | ×2.2 | 2.4% | Possible |
|
Malfunction indicator lamp
Noise, emissions and leaks > Exhaust emissions > Compression ignition > Malfunction indicator lamp
|
Any | 45 | ×2.1 | 3.9% | Possible |
|
Stop lamp
Lamps, reflectors and electrical equipment > Stop lamp
|
Any | 131 | ×2.0 | 11.3% | 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).