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 731 of 732 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 — 15.3% of this year's failed first attempts
Recorded on 112 of those tests. It tops the table on elevation — about 7.0× 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 |
|---|---|---|---|---|---|
|
Outline marker lamp (rear)
Lamps, reflectors and electrical equipment > Outline marker lamps > Outline marker lamp
|
Rear | 33 | ×36 | 4.5% | Likely |
|
Sub-frame mounting prescribed areas (front)
Suspension > Sub-frames > Sub-frame mounting prescribed areas
|
Front | 40 | ×8.9 | 5.5% | Likely |
|
Integral vehicle structure condition (front)
Body, chassis, structure > Integral vehicle structure > Integral vehicle structure condition
|
Front | 58 | ×7.2 | 7.9% | Likely |
|
Electrical equipment — Horn
Lamps, reflectors and electrical equipment > Electrical equipment > Horn
|
Any | 112 | ×7.0 | 15.3% | Strong |
|
Component mounting prescribed areas (front)
Suspension > Component mounting prescribed areas
|
Front | 104 | ×6.6 | 14.2% | Strong |
| Diesel emissions test (pre-reg turbo rules before 01/07/2008) | Any | 22 | ×6.3 | 3.0% | Possible |
|
Chassis condition (front)
Body, chassis, structure > Chassis > Chassis condition
|
Front | 63 | ×6.3 | 8.6% | Likely |
|
Rigid brake pipes (front)
Brakes > Rigid brake pipes
|
Front | 45 | ×3.2 | 6.2% | Likely |
|
Individual direction indicators (front)
Lamps, reflectors and electrical equipment > Direction indicators > Flashing type > Individual direction indicators
|
Front | 38 | ×2.9 | 5.2% | Possible |
|
Prescribed areas (front)
Seat belts and supplementary restraint systems > Seat belts > Prescribed areas
|
Front | 20 | ×2.8 | 2.7% | 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).