Owners have filed 8 complaints on the Jaguar XJ12, covering 1994–1996. The system named most often is Engine And Engine Cooling (3 reports). Worst years by volume: 1994, 1996; cleanest: 1996, 1994. 0 reports describe a crash, 1 a fire. On average the car was 4.0 years old when the problem happened.
What breaks on Jaguar XJ12
Grouped by the system owners named — percentages are shares of all 8 XJ12 complaints. Open any row for the full reports in owners' own words.
Engine And Engine Cooling 3 Read
This is a 12 cylinder engine with only 6 cylinders working. This caused unburned fuel and air to be pumped into the fuel exhaust system, which then overheated the catalytic converter and started a fire. Dealer has been contacted
Vehicle continues to experience engine failures, hydraulic reservior leaking on one repair
The contact owns a 1994 jaguar xj12. The contact stated that the vehicle developed a leak in the coolant expansion tank along the seam weld. While driving 55 mph, the radiator fluid leaked and the vehicle overheated. The vehicle was repaired, but the failure recurred. Recall service # 5451 was found on autozone.com…
Service Brakes 2 Read
Cruise control locked up -- car continued to accelerate -- brakes inoperative against a 300 hp engine -- condition corrected when cruise turned off
Made a left turn, attempted to stop with foot on brake, back wheels spun and smoked. Throttle stuck and would not release. Almost standing, holding foot on brake. Finally released brake and car slowed down
Exterior Lighting 1 Read
Back up lights failed
Power Train 1 Read
Oxygen sensor relay failed, resulting in vehicle not starting
Electrical System 1 Read
Vehicle fails to start with turn of key. After several attempts it will start
XJ12 years to avoid — and the clean ones
Complaints per model year. More reports usually means more cars on the road as well as more trouble, so read the crash and fire columns alongside the count.
| Model year | Complaints | Top system | Crashes | Fires |
|---|---|---|---|---|
| 1996 | Exterior Lighting | — | — | |
| 1994 | Electrical System | — | 1 |
The same model year, different builds
Every complaint carries the first 11 characters of the VIN — plant, year, body and engine. That is a production series, and complaints are spread across them very unevenly.
| Measure | Value |
|---|---|
| Distinct production series | 7 |
| Average complaints per series | 1.1 |
| Worst single series | 2 complaints |
| Average age at failure | 4.0 years |
A model average of 1.1 hides a worst series at 2. Enter a VIN above to see the numbers for that exact build instead of the model as a whole.
Owners reported these. Find out if yours is one of them.
- Complaints matched to the exact production run, not just the model
- What the car is worth given what tends to fail on it
- The original window sticker and factory options
- Full research report as a PDF for the pre-purchase inspection
- No ads, on every page
- No ads, no tracking — and much more
How we count
Every figure here comes from complaints owners filed with NHTSA — 1,100,006 of them, covering 1,982 models built between 1981 and 2026.
A complaint is an unverified report: someone wrote down what happened to their car. It is not a confirmed defect and not a recall. What makes the volume useful is the pattern — when thousands of owners of the same build describe the same failure, that is a signal no marketing brochure will give you.
Two things we do that the source does not. First, we compute the age of the car at the moment of failure from the incident date and the model year. Second, we group complaints by the first 11 characters of the VIN — the production series — so a bad plant run does not disappear into a model-wide average.
Frequently asked questions
What are the worst years for the XJ12?
By complaint volume, 1994, 1996 drew the most owner reports. Bear in mind that popular years put more cars on the road, so check the crash and fire columns too.
Which XJ12 years are the cleanest?
1996, 1994 have the fewest complaints on file. For recent years that can simply mean the cars are young.
How many complaints does the Jaguar XJ12 have?
8 owner complaints filed with NHTSA, covering 1994–1996. Of those, 0 describe a crash and 1 a fire.
Are these complaints verified?
No. They are unverified reports from owners. NHTSA publishes them as filed and investigates only a fraction. The value is in the pattern, not in any single report.
Can I check complaints for one specific car?
Yes — enter its VIN above. We match the first 11 characters, which identify the plant, year, body and engine, so you get complaints on that exact production series rather than the whole model.