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 9,020 of 9,029 failed first attempts (99.9%) that recorded an odometer reading in 2025 — the subset the age-and-mileage comparison can be computed on.
Standout: Fuel cap/sealing device — 3.4% of this year's failed first attempts
Recorded on 305 of those tests. It tops the table on elevation — about 6.7× 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 |
|---|---|---|---|---|---|
|
Fuel cap/sealing device
Body, chassis, structure > Fuel system > Fuel cap/sealing device
|
Any | 305 | ×6.7 | 3.4% | Strong |
|
Sub-frame (front)
Suspension > Sub-frames > Sub-frame
|
Front | 340 | ×6.7 | 3.8% | Strong |
|
Catalyst emissions
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Catalyst emissions
|
Any | 2,230 | ×4.9 | 24.7% | Likely |
|
SRS malfunction indicator lamp
Seat belts and supplementary restraint systems > SRS malfunction indicator lamp
|
Any | 463 | ×2.6 | 5.1% | Possible |
|
Malfunction indicator lamp
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Malfunction indicator lamp
|
Any | 1,032 | ×2.3 | 11.4% | Possible |
|
Emissions not tested
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Emissions not tested
|
Any | 363 | ×2.1 | 4.0% | 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).