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 1,388 failed first attempts in 2025 that the age-and-mileage comparison can be computed on.
Standout: Chassis condition (rear) — 11.2% of this year's failed first attempts
Recorded on 156 of those tests. It tops the table on elevation — about 27× 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 |
|---|---|---|---|---|---|
|
Spring mounting prescribed areas (rear)
Suspension > Springs > Spring mounting prescribed areas
|
Rear | 44 | ×27 | 3.2% | Likely |
|
Chassis condition (rear)
Body, chassis, structure > Chassis > Chassis condition
|
Rear | 156 | ×27 | 11.2% | Strong |
|
Prescribed areas (rear)
Seat belts and supplementary restraint systems > Seat belts > Prescribed areas
|
Rear | 35 | ×17 | 2.5% | Likely |
|
Chassis condition (front)
Body, chassis, structure > Chassis > Chassis condition
|
Front | 52 | ×16 | 3.7% | Likely |
|
Fuel system — Tank
Body, chassis, structure > Fuel system > Tank
|
Any | 31 | ×15 | 2.2% | Likely |
|
Leaf spring (rear)
Suspension > Springs > Leaf springs > Leaf spring
|
Rear | 40 | ×8.5 | 2.9% | Likely |
|
Integral vehicle structure condition (rear)
Body, chassis, structure > Integral vehicle structure > Integral vehicle structure condition
|
Rear | 33 | ×7.9 | 2.4% | Likely |
|
Component mounting prescribed areas (rear)
Suspension > Component mounting prescribed areas
|
Rear | 151 | ×7.4 | 10.9% | Strong |
|
Electrical equipment — Horn
Lamps, reflectors and electrical equipment > Electrical equipment > Horn
|
Any | 120 | ×6.2 | 8.6% | Strong |
|
Rear fog lamp (rear)
Lamps, reflectors and electrical equipment > Front and rear fog lamps > Rear fog lamp > Rear fog lamp
|
Rear | 101 | ×5.4 | 7.3% | Strong |
Only patterns that clear minimum sample and elevation thresholds are shown (at least 20 failures and about 2.0× more often than similar cars).