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Jaguar Xj vs Jaguar Xj4.2c: reliability comparison

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

Jaguar Xj
77%
MOT pass rate · 80,612 vehicles
Jaguar Xj4.2c
71%
MOT pass rate · 2 vehicles
Verdict: On MOT pass rate the Jaguar Xj (77%) and Jaguar Xj4.2c (71%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Jaguar Xj Jaguar Xj4.2c
MOT pass rate 77% ✓ 71%
MOT failure rate 23% ✓ 29%
Faults & advisories per test 2.0 ✓ 2.6
Dangerous-fault share 1% 0% ✓
Average mileage 113,306 mi 48,008 mi
Sample size (vehicles) 80,612 2

Most common faults

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)

Jaguar Xj4.2c

  1. Offside Rear Suspension component mounting prescribed area is excessively corroded (2.4.A.3)
  2. Parking brake: efficiency below requirements (3.7.B.7)
  3. Exhaust emissions carbon monoxide content excessive (7.3.B.1a)
  4. Windscreen washer provides insufficient washer liquid (8.2.3)
  5. Brake performance not tested (3.7.A.1)
  6. Hazard warning lamps not flashing in phase, with ignition off (1.4.B.1f)

Reliability FAQ

On MOT pass rate the Jaguar Xj (77%) and Jaguar Xj4.2c (71%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Jaguar Xj report Full Jaguar Xj4.2c 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.