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Jaguar 4.2 vs Jaguar Xj: reliability comparison

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

Jaguar 4.2
76%
MOT pass rate · 5 vehicles
Jaguar Xj
77%
MOT pass rate · 80,612 vehicles
Verdict: On MOT pass rate the Jaguar 4.2 (76%) 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 4.2 Jaguar Xj
MOT pass rate 76% 77% ✓
MOT failure rate 24% 23% ✓
Faults & advisories per test 1.4 ✓ 2.0
Dangerous-fault share 0% ✓ 1%
Average mileage 67,418 mi 113,306 mi
Sample size (vehicles) 5 80,612

Most common faults

Jaguar 4.2

  1. Nearside Front wheel bearing has slight play (2.5.A.3c)
  2. Parking brake: efficiency below requirements (3.7.B.7)
  3. Brake pedal anti-slip provision missing (3.3.A.1b)
  4. Front passenger door cannot be opened from outside the vehicle (6.2.B.1b)
  5. Parking brake: efficiency below requirements (3.7.C.1b)
  6. Offside Front Seat belt webbing slightly damaged or frayed (7.1.2 (b) (ii))

Jaguar Xj

  1. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  2. Offside Rear Tyre worn close to the legal limit (4.1.E.1)
  3. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  4. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  5. Nearside Front wheel bearing has slight play (2.5.A.3c)
  6. Offside Front wheel bearing has slight play (2.5.A.3c)

Reliability FAQ

On MOT pass rate the Jaguar 4.2 (76%) and Jaguar Xj (77%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Jaguar 4.2 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.