Most common 2000 Jaguar XJ problems
Share of the 17 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Jaguar XJ complaints by model year
Best XJ years: 2010, 2017, 2008. Years to avoid: 2005, 2006. Compare all years →
What 2000 Jaguar XJ owners say
Engine & cooling
Jaguar 2000 xjr: while driving vehicle would suddenly display warning message that traction control / asc was not available and would go into a failsafe engine mode. Engine would then run very roughly and would not accelerate past 5-10mph. Mechanic diagnosed a fault code of p0121 which is addressed as a known Jaguar technical service bulletin for a "mismatched" connector to the throttle body. Internet research reveals that this is a very common problem experienced by many Jaguar owners that is known by Jaguar and constitutes a safety hazard. Jaguar knows that it mismatched gold and tin plated throttle body connectors and advised its repair tech's to replace only if customer complains! How will a customer know such a problem exists until it happens and it will happen eventually. …
Tl contact own a 2000 Jaguar XJ. The contact stated that the driver attempted to start the vehicle that was parked in his garage. The vehicle would not start. The contact stated that the driver and passenger smelled a slight burning odor after trying to start the vehicle. The vehicle was towed to a personal mechanic on January 20, 2010. The mechanic stated that the timing chain guides/tensioners failed. The mechanic took pictures of the timing chain. The contact stated that the vehicle was still at the mechanic at the time of the complaint the approximate failure and current mileages was 93,000. Updated 4/30/10 the timing chain guides which was made of cheap plastic caused the timing chain to break and jam into the gear and pistons and then damaged the valves. Updated 08/18/10
Speed control & acceleration
The car is:Jaguar year 2000 xjr 4.0l, w/supercharger with. I was driving on the pennsylvania turnpike at the speed limit when suddenly the engine started running at slow idle speed. The engine speed would not respond to the position of the accelerator pedal. I was told later by progressive auto repair in hamilton va that the problem was that the accelerator pedal position sensor had failed and had to be replaced. I was told that this was attached to the throttle body assembly and could not be bought separately from the throttle body assembly. I bought a new throttle body assembly but still have the replaced assembly including the failed accelerator pedal position sensor. I remember searching the internet about this sensor and am almost sure that this jag accelerator pedal position sensor is made by the same manufacturer that makes this sensor for Toyota. …
No events leading up to failure. No warning lights or prior indication of any problem. Car shut down at interstate speed with no warning. Had to get over 2 lanes of traffic and out of harms way and pull off of interstate. Very dangerous time. Replaced body throttle and charged me $1,563.17 + labor. Old part is available. I was very shaken up after this incident and very concerned that you could just be driving down the interstate and with no warning at all your car would just shut down. This is extremely dangerous. I had this happen on another Jaguar back in the late 1990's and it was a recalled part believed to be the same problem still existing on this car. At that time the dealer said it was a recall and replaced it but same thing on this newer model and no recall. It seems to be the same problem and I feel it should also be recalled. Thank you,
2000 Jaguar XJ engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 4.0L 8-cyl | 5-speed automatic | RWD | 15 / 22 / 18 |
EPA ratings. Class: Compact car.
Frequently asked questions
Is the 2000 Jaguar XJ a good car?
Based on 17 owner complaints filed with NHTSA, the 2000 XJ rates average: 1.3× as many complaints as a typical year of the XJ at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2000 Jaguar XJ?
The engine & cooling — 6 complaints, 35% of all complaints for this model year, most often about engine. Next are the speed control & acceleration (4) and transmission & drivetrain (2).
How many recalls does the 2000 Jaguar XJ have?
NHTSA lists no recalls for the 2000 Jaguar XJ. You can still confirm with your VIN using our VIN recall check.
What are the best and worst years of the Jaguar XJ?
The best years by complaints, compared at the same age, are 2010, 2017 and 2008. Years to avoid or approach with caution: 2005 and 2006. See the full Jaguar XJ years comparison.
At what mileage do 2000 Jaguar XJ problems happen?
The median mileage reported in complaints is about 80,000 miles; 38% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.