Jaguar Sovereign 4.0 vs Jaguar Xj: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Jaguar Sovereign 4.0
—
MOT pass rate · 57 vehicles
Jaguar Xj
77%
MOT pass rate · 80,612 vehicles
Verdict: On MOT pass rate the Jaguar Sovereign 4.0 (0%) and Jaguar Xj (77%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Jaguar Sovereign 4.0 | Jaguar Xj |
|---|---|---|
| MOT pass rate | 0% | 77% ✓ |
| MOT failure rate | 0% ✓ | 23% |
| Faults & advisories per test | 0.0 ✓ | 2.0 |
| Dangerous-fault share | — ✓ | 1% |
| Average mileage | — | 113,306 mi |
| Sample size (vehicles) | 57 | 80,612 |
Most common faults
Jaguar Sovereign 4.0
No fault breakdown available.
Jaguar Xj
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
- Offside Rear Tyre worn close to the legal limit (4.1.E.1)
- 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 wheel bearing has slight play (2.5.A.3c)
- Offside Front wheel bearing has slight play (2.5.A.3c)
Reliability FAQ
On MOT pass rate the Jaguar Sovereign 4.0 (0%) and Jaguar Xj (77%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Jaguar Sovereign 4.0 report Full Jaguar Xj 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.