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 3,345 failed first attempts in 2025 that the age-and-mileage comparison can be computed on.
Standout: Decelerometer (sp) — 9.4% of this year's failed first attempts
Recorded on 315 of those tests. It tops the table on elevation — about 38× 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 |
|---|---|---|---|---|---|
|
Decelerometer (sp)
Brakes > Brake performance > Parking brake efficiency (sp) > Decelerometer (sp)
|
Any | 315 | ×38 | 9.4% | Strong |
|
Sub-frame (rear)
Suspension > Sub-frames > Sub-frame
|
Rear | 99 | ×6.1 | 3.0% | Likely |
|
Linkage ball joints (rear)
Suspension > Anti-roll bars > Linkage ball joints
|
Rear | 123 | ×6.1 | 3.7% | Strong |
|
Shock absorbers (rear)
Suspension > Shock absorbers
|
Rear | 377 | ×3.8 | 11.3% | Likely |
|
Individual direction indicators (front)
Lamps, reflectors and electrical equipment > Direction indicators > Flashing type > Individual direction indicators
|
Front | 71 | ×2.3 | 2.1% | 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).