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 1,660 failed first attempts in 2025 that the age-and-mileage comparison can be computed on.
Standout: Chassis condition (rear) — 5.0% of this year's failed first attempts
Recorded on 83 of those tests. It tops the table on elevation — about 78× 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.
No patterns met the strongest callout thresholds on this page; showing the highest-lift rows that still cleared the display floors.
| Fault pattern | Location | Failures | vs similar cars | Share of fails | Confidence |
|---|---|---|---|---|---|
|
Chassis condition (rear)
Body, chassis, structure > Chassis > Chassis condition
|
Rear | 83 | ×78 | 5.0% | Likely |
|
Leaf spring (rear)
Suspension > Springs > Leaf springs > Leaf spring
|
Rear | 72 | ×43 | 4.3% | Likely |
|
Component mounting prescribed areas (rear)
Suspension > Component mounting prescribed areas
|
Rear | 58 | ×16 | 3.5% | Likely |
|
Service brake performance
Brakes > Brake performance > Service Brake Efficiency (sp) > Rbt (sp) > Service brake performance
|
Any | 66 | ×7.4 | 4.0% | Likely |
|
Rigid brake pipes (rear)
Brakes > Rigid brake pipes
|
Rear | 97 | ×6.1 | 5.8% | Likely |
|
Service brake imbalance (rear)
Brakes > Brake performance > Service Brake Efficiency (sp) > Rbt (sp) > Service brake imbalance
|
Rear | 45 | ×4.2 | 2.7% | Likely |
|
Rear fog lamp
Lamps, reflectors and electrical equipment > Front and rear fog lamps > Rear fog lamp > Rear fog lamp
|
Any | 69 | ×3.8 | 4.2% | Likely |
|
Electrical equipment — Horn
Lamps, reflectors and electrical equipment > Electrical equipment > Horn
|
Any | 92 | ×3.8 | 5.5% | Likely |
|
Exhaust system (rear)
Body, chassis, structure > Exhaust system
|
Rear | 58 | ×3.7 | 3.5% | Likely |
|
Rigid brake pipes (front)
Brakes > Rigid brake pipes
|
Front | 41 | ×3.7 | 2.5% | 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).