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Jaguar Mk 4 vs Jaguar Xj: reliability comparison

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

Jaguar Mk 4
91%
MOT pass rate · 11 vehicles
Jaguar Xj
77%
MOT pass rate · 80,612 vehicles
Verdict: On MOT pass rate the Jaguar Mk 4 (91%) 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 Mk 4 Jaguar Xj
MOT pass rate 91% ✓ 77%
MOT failure rate 9% ✓ 23%
Faults & advisories per test 0.4 ✓ 2.0
Dangerous-fault share 0% ✓ 1%
Average mileage 53,116 mi 113,306 mi
Sample size (vehicles) 11 80,612

Most common faults

Jaguar Mk 4

  1. Offside Front Axle king pin has slight play in pin and/or bush (2.5.A.3a)
  2. Nearside Front Axle king pin has slight play in pin and/or bush (2.5.A.3a)
  3. Steering system has slight free play detected at steering wheel (2.2.A.1a)
  4. Nearside Rear Shock absorber has a light misting of oil (2.7.3)
  5. Offside Rear Shock absorber has a light misting of oil (2.7.3)
  6. Nearside Front Tyre worn close to the legal limit (4.1.E.1)

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 Mk 4 (91%) and Jaguar Xj (77%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Jaguar Mk 4 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.