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 1,086 failed first attempts in 2025 that the age-and-mileage comparison can be computed on.
Standout: Rear fog lamp (rear) — 18.9% of this year's failed first attempts
Recorded on 205 of those tests. It tops the table on elevation — about 16× 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 |
|---|---|---|---|---|---|
|
Leaf spring (rear)
Suspension > Springs > Leaf springs > Leaf spring
|
Rear | 65 | ×33 | 6.0% | Likely |
|
Rear fog lamp (rear)
Lamps, reflectors and electrical equipment > Front and rear fog lamps > Rear fog lamp > Rear fog lamp
|
Rear | 205 | ×16 | 18.9% | Strong |
|
Chassis condition (rear)
Body, chassis, structure > Chassis > Chassis condition
|
Rear | 25 | ×11 | 2.3% | Possible |
|
Rigid brake pipes (front)
Brakes > Rigid brake pipes
|
Front | 68 | ×8.3 | 6.3% | Likely |
|
Rigid brake pipes (rear)
Brakes > Rigid brake pipes
|
Rear | 112 | ×7.7 | 10.3% | Strong |
|
Anti-lock braking system
Brakes > ABS / EBS / ESC > Anti-lock braking system
|
Any | 73 | ×4.6 | 6.7% | Likely |
| Diesel emissions test (compression-ignition rules for vehicles from 01/07/2008) | Any | 59 | ×3.7 | 5.4% | Likely |
|
Wheel bearings (front)
Suspension > Wheel bearings
|
Front | 46 | ×3.5 | 4.2% | Likely |
|
Component mounting prescribed areas (rear)
Suspension > Component mounting prescribed areas
|
Rear | 24 | ×2.8 | 2.2% | Possible |
|
Shock absorbers (front)
Suspension > Shock absorbers
|
Front | 56 | ×2.7 | 5.2% | 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).