Seat 666e vs Seat Leon: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Seat 666e
50%
MOT pass rate · 1 vehicles
Seat Leon
78%
MOT pass rate · 262,792 vehicles
Verdict: On MOT pass rate the Seat 666e (50%) and Seat Leon (78%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Seat 666e | Seat Leon |
|---|---|---|
| MOT pass rate | 50% | 78% ✓ |
| MOT failure rate | 50% | 22% ✓ |
| Faults & advisories per test | 2.0 | 1.8 ✓ |
| Dangerous-fault share | 0% ✓ | 3% |
| Average mileage | 7,421 mi | 103,954 mi |
| Sample size (vehicles) | 1 | 262,792 |
Most common faults
Seat 666e
- Nearside Front Direction indicator slightly discoloured (1.4.A.2f)
- Offside Front Direction indicator slightly discoloured (1.4.A.2f)
- Nearside Rear Brake clevis joint locking device insecure (3.5.1l)
- Offside Rear Brake clevis joint locking device insecure (3.5.1l)
- Offside Rear rear brake binding (3.7.B.1)
Seat Leon
- Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
- Nearside Front Shock absorbers has light misting of oil (5.3.2 (b))
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
Reliability FAQ
On MOT pass rate the Seat 666e (50%) and Seat Leon (78%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Seat 666e report Full Seat Leon 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.