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 4,786 of 4,792 failed first attempts (99.9%) that recorded an odometer reading in 2025 — the subset the age-and-mileage comparison can be computed on.
Standout: Decelerometer (sp) — 8.4% of this year's failed first attempts
Recorded on 402 of those tests. It tops the table on elevation — about 21× 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 | 402 | ×21 | 8.4% | Strong |
|
Sub-frame (rear)
Suspension > Sub-frames > Sub-frame
|
Rear | 233 | ×13 | 4.9% | Strong |
|
Drive shafts — Joints (rear)
Body, chassis, structure > Transmission > Drive shafts > Joints
|
Rear | 128 | ×11 | 2.7% | Strong |
|
Linkage ball joints (rear)
Suspension > Anti-roll bars > Linkage ball joints
|
Rear | 238 | ×6.7 | 5.0% | Strong |
|
Prescribed areas (rear)
Seat belts and supplementary restraint systems > Seat belts > Prescribed areas
|
Rear | 116 | ×4.4 | 2.4% | Likely |
|
Steering rack (front)
Steering > Steering gear > Steering rack
|
Front | 118 | ×3.4 | 2.5% | Likely |
|
Shock absorbers (rear)
Suspension > Shock absorbers
|
Rear | 338 | ×2.2 | 7.1% | Possible |
|
Individual direction indicators (front)
Lamps, reflectors and electrical equipment > Direction indicators > Flashing type > Individual direction indicators
|
Front | 130 | ×2.2 | 2.7% | Possible |
|
Individual direction indicators (rear)
Lamps, reflectors and electrical equipment > Direction indicators > Flashing type > Individual direction indicators
|
Rear | 202 | ×2.2 | 4.2% | 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).