Jaguar 420 vs Jaguar S-type: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Jaguar 420
80%
MOT pass rate · 1,485 vehicles
More reliable
Jaguar S-type
75%
MOT pass rate · 61,983 vehicles
Verdict: On MOT pass rate, the Jaguar 420 is the more reliable of the two — 80% pass first time versus 75%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Jaguar 420 | Jaguar S-type |
|---|---|---|
| MOT pass rate | 80% ✓ | 75% |
| MOT failure rate | 20% ✓ | 25% |
| Faults & advisories per test | 1.6 ✓ | 2.1 |
| Dangerous-fault share | 0% ✓ | 1% |
| Average mileage | 56,899 mi | 114,746 mi |
| Sample size (vehicles) | 1,485 | 61,983 |
Most common faults
Jaguar 420
- Oil leak
- Offside Rear wheel bearing has slight play (2.6.2)
- Parking brake: efficiency below requirements (3.7.B.7)
- Nearside Rear wheel bearing has slight play (2.6.2)
- Windscreen washer provides insufficient washer liquid (8.2.3)
- Nearside Front wheel bearing has slight play (2.5.A.3c)
Jaguar S-type
- 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)
- Under-trays fitted obscuring some underside components
- Front Brake pad(s) wearing thin (3.5.1g)
Reliability FAQ
On MOT pass rate, the Jaguar 420 is the more reliable of the two — 80% pass first time versus 75%. It's one signal among several; check the full breakdown below.
Full Jaguar 420 report Full Jaguar S-type 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.