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 524 failed first attempts in 2025 that the age-and-mileage comparison can be computed on.
Standout: Rbt (sp) — 38.5% of this year's failed first attempts
Recorded on 202 of those tests. It tops the table on elevation — about 5.8× 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 |
|---|---|---|---|---|---|
|
Sub-frame (rear)
Suspension > Sub-frames > Sub-frame
|
Rear | 31 | ×17 | 5.9% | Likely |
|
Steering rack (front)
Steering > Steering gear > Steering rack
|
Front | 27 | ×9.8 | 5.2% | Possible |
|
Rbt (sp)
Brakes > Brake performance > Parking brake efficiency (sp) > Rbt (sp)
|
Any | 202 | ×5.8 | 38.5% | Strong |
|
Anti-lock braking system
Brakes > ABS / EBS / ESC > Anti-lock braking system
|
Any | 49 | ×4.2 | 9.4% | Likely |
|
Parking brake performance (rear)
Brakes > Brake performance > Parking brake performance > Rbt > Parking brake performance
|
Rear | 25 | ×4.2 | 4.8% | Possible |
|
Service brake performance (front)
Brakes > Brake performance > Service brake performance > Rbt > Service brake performance
|
Front | 41 | ×4.0 | 7.8% | Likely |
|
Exhaust system (rear)
Body, chassis, structure > Exhaust system
|
Rear | 37 | ×3.5 | 7.1% | Likely |
|
Emissions not tested
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Emissions not tested
|
Any | 27 | ×2.7 | 5.2% | Possible |
|
Catalyst emissions
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Catalyst emissions
|
Any | 66 | ×2.3 | 12.6% | 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).