1999 Jaguar XJ · 1,956 MOT tests
1999 Jaguar XJ reliability
1999 Jaguar XJs fail 33.1% of first MOT tests, 11% fewer MOT fails than the average car its age and mileage, ranking 23 of 23 XJ years (1,956 DVSA tests, 2022 to 2024).
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- first-time fail rate (all Jaguar XJs: 22.6%)
- 33.1%
- first-time fail rate (all Jaguar XJs: 22.6%)
- fails than cars of the same age and mileage
- 11% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 24
- 90,802
- typical miles at its MOT, aged about 24
- MOT tests, 2022 to 2024
- 1,956
- MOT tests, 2022 to 2024
Year on year
1999 against the years either side
- 1998 cars: 14% fewer MOT fails than the average car its age (the 1999 car does worse)
- 2000 cars: 22% fewer MOT fails than the average car its age (the 1999 car does worse)
- Weak spot: exhaust, emissions and leaks, 13.9% of tests fail here (91% above cars of the same age and mileage).
- Strong point: steering, 49% fewer fails than comparable cars.
Common problems
What fails on a 1999 Jaguar XJ
Fail rate by area
- Exhaust, emissions and leaks13.9%
- Suspension12.8%
- Lights and electrics9.2%
- Brakes8.7%
- Body, chassis and structure8.5%
- Windscreen, wipers and mirrors5.1%
- Seat belts and airbags3.4%
Average for cars of the same age and mileage
Top failures
Lambda reading outside specified limits 5.06%
An out-of-range lambda reading suggests poor fuel mixture or a failing catalytic converter, so diagnosis is needed.
Suspension mounting area seriously corroded 4.5%
Corrosion near suspension mountings can seriously weaken the body structure, so an expert inspection is needed.
Carbon monoxide high after fast idle 3.02%
High carbon monoxide can point to engine or catalytic converter faults, so ask for diagnosis before buying.
ABS warning lamp shows a fault 2.35%
A lit ABS warning means the anti-lock system may not work, so wheels could lock during emergency braking.
Wiper blade not clearing windscreen 2.3%
Wipers that do not clear the windscreen reduce visibility in rain, which is a safety risk, so replace them.
Carbon monoxide above manufacturer's idle limit 1.84%
Exceeding the manufacturer's idle limit suggests engine tuning or emission faults, so the car needs diagnosis before buying.
Common advisories
Tyre worn close to legal limit (7.11%) · Brake pipes corroded and greasy (6.7%) · Tyre slightly damaged or cracking (6.49%) · Suspension mounting area showing corrosion (5.98%) · Wheel bearing slight play (5.93%) · Coil spring showing some corrosion (5.67%)
Other years
Every Jaguar XJ year
The full picture: Jaguar XJ reliability. Before you pay for any Jaguar XJ, a Full Check (£9.99) shows finance, stolen and write-off records the MOT can't.
Source: DVSA anonymised MOT results, 2022 to 2024, class 4 normal tests.
Is a 1999 Jaguar XJ reliable?
1999 Jaguar XJs fail 33.1% of first MOT tests, 11% fewer MOT fails than the average car its age and mileage, ranking 23 of 23 XJ years (1,956 DVSA tests, 2022 to 2024).
What fails on a 1999 Jaguar XJ MOT?
Most often lambda reading outside specified limits (5.06% of tests), suspension mounting area seriously corroded (4.5% of tests), carbon monoxide high after fast idle (3.02% of tests).
How many miles should a 1999 Jaguar XJ have done?
At its MOT aged about 24, a typical 1999 Jaguar XJ shows 90,802 miles. Much higher or lower is worth asking about.
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