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Bentley Series1 vs Bentley Unknown: reliability comparison

MOT pass rates, common faults and mileage compared from real UK MOT data.

Bentley Series1
100%
MOT pass rate · 4 vehicles
Bentley Unknown
90%
MOT pass rate · 9,548 vehicles
Verdict: On MOT pass rate the Bentley Series1 (100%) 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 Series1 Bentley Unknown
MOT pass rate 100% ✓ 90%
MOT failure rate 0% ✓ 10%
Faults & advisories per test 1.0 0.9 ✓
Dangerous-fault share 0% ✓ 7%
Average mileage 51,306 mi 34,409 mi
Sample size (vehicles) 4 9,548

Most common faults

Bentley Series1

  1. Nearside Front Axle king pin has slight play in pin and/or bush (2.5.A.3a)
  2. Exhaust has a minor leak of exhaust gases (7.1.2)
  3. Nearside Front Steering pivot point has slight play (2.2.B.1g)
  4. Nearside Front Front wheel bearing has slight play (2.5.A.3c)
  5. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  6. Windscreen has damage to an area less than a 40mm circle outside zone 'A' (8.3.1d)

Bentley Unknown

  1. COVID-19 6 MONTH EXTENSION
  2. Parking brake efficiency less than 50% of the required value (1.4.2 (a) (ii))
  3. Parking brake: efficiency below requirements (3.7.B.7)
  4. Windscreen washer provides insufficient washer liquid (8.2.3)
  5. Oil leak
  6. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Reliability FAQ

On MOT pass rate the Bentley Series1 (100%) and Bentley Unknown (90%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Bentley Series1 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.