Bentley Sii continental vs Bentley Unknown: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Bentley Sii continental
94%
MOT pass rate · 1 vehicles
Bentley Unknown
90%
MOT pass rate · 9,548 vehicles
Verdict: On MOT pass rate the Bentley Sii continental (94%) and Bentley Unknown (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Bentley Sii continental | Bentley Unknown |
|---|---|---|
| MOT pass rate | 94% ✓ | 90% |
| MOT failure rate | 6% ✓ | 10% |
| Faults & advisories per test | 0.9 | 0.9 |
| Dangerous-fault share | 0% ✓ | 7% |
| Average mileage | 20,976 mi | 34,409 mi |
| Sample size (vehicles) | 1 | 9,548 |
Most common faults
Bentley Sii continental
- Parking brake lever has little reserve travel (3.1.6b)
- rubber exhaust mount perished
- Oil leak
- Steering system has slight free play detected at steering wheel (2.2.A.1a)
- seat back rests worn on the front but holding in postion at time of test
- Nearside Headlamp not working on main beam (1.7.5a)
Bentley Unknown
- COVID-19 6 MONTH EXTENSION
- Parking brake efficiency less than 50% of the required value (1.4.2 (a) (ii))
- Parking brake: efficiency below requirements (3.7.B.7)
- Windscreen washer provides insufficient washer liquid (8.2.3)
- Oil leak
- Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
Reliability FAQ
On MOT pass rate the Bentley Sii continental (94%) and Bentley Unknown (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Bentley Sii continental report Full Bentley Unknown report Most reliable cars
Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.