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 1,668 failed first attempts in 2025 that the age-and-mileage comparison can be computed on.
Standout: SRS malfunction indicator lamp — 18.0% of this year's failed first attempts
Recorded on 300 of those tests. It tops the table on elevation — about 15× 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 |
|---|---|---|---|---|---|
|
SRS malfunction indicator lamp
Seat belts and supplementary restraint systems > SRS malfunction indicator lamp
|
Any | 300 | ×15 | 18.0% | Strong |
|
Rigid brake pipes (rear)
Brakes > Rigid brake pipes
|
Rear | 147 | ×9.8 | 8.8% | Strong |
|
Ball joint dust cover (front)
Suspension > Suspension arms > Ball joint dust cover
|
Front | 225 | ×7.6 | 13.5% | Strong |
|
Registration plates (front)
Identification of the vehicle > Registration plates
|
Front | 52 | ×5.7 | 3.1% | Likely |
|
Registration plates (rear)
Identification of the vehicle > Registration plates
|
Rear | 49 | ×5.1 | 2.9% | Likely |
|
Brake performance not tested
Brakes > Brake performance > Brake performance not tested
|
Any | 37 | ×5.0 | 2.2% | Likely |
Only patterns that clear minimum sample and elevation thresholds are shown (at least 20 failures and about 2.0× more often than similar cars).