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 12,005 of 12,013 failed first attempts (99.9%) that recorded an odometer reading in 2025 — the subset the age-and-mileage comparison can be computed on.
Standout: Catalyst emissions — 20.0% of this year's failed first attempts
Recorded on 2,399 of those tests. It tops the table on elevation — about 7.5× 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 |
|---|---|---|---|---|---|
|
Catalyst emissions
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Catalyst emissions
|
Any | 2,399 | ×7.5 | 20.0% | Strong |
|
Wheel bearings (rear)
Suspension > Wheel bearings
|
Rear | 277 | ×4.9 | 2.3% | Likely |
|
Exhaust system (front)
Body, chassis, structure > Exhaust system
|
Front | 464 | ×4.7 | 3.9% | Likely |
|
Emissions not tested
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Emissions not tested
|
Any | 497 | ×4.5 | 4.1% | Likely |
|
Drive shafts — Joints (front)
Body, chassis, structure > Transmission > Drive shafts > Joints
|
Front | 1,814 | ×3.6 | 15.1% | Likely |
|
Exhaust system (rear)
Body, chassis, structure > Exhaust system
|
Rear | 660 | ×3.2 | 5.5% | Likely |
|
Malfunction indicator lamp
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Malfunction indicator lamp
|
Any | 998 | ×3.1 | 8.3% | 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).