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. I am submitting this complaint because I wonder if the sensor could fail and cause the engine to go to maximum acceleration and, if so, could this be the source of the Toyota acceleration problems" if this accelerator position sensor is in fact made by the same manufacturer, then could this problem be lurking in other brands of cars such as Jaguar"

- Paeonian Springs, VA, USA

The contact owned a 2000 Jaguar XJ8. The contact stated that he frequently experienced unwarranted vehicle acceleration. When the failure occurs, the RPM's increase to 4,000-6,000. The risk of a serious crash was significantly increased. The dealer could not duplicate the failure or produce any error codes to provide a sufficient remedy. He took the vehicle to an independent repair shop and the mechanic located an evaporated system fault error code; however, no repairs were made. The manufacturer would not assist. The failure and current mileages were 92,500. Updated 03/23/09. The consumer traded the vehicle in. Updated 03/24/09.

- Saint Louis, , MO, USA

Unsafe condition: 1. in early spring I approached a pedestrian crossing and applied brake. 2. when I was stopped with my auto in gear and my foot on the brake the engine began racing, the car tried to drive forward into the crosswalk and the back end started fish tailing. 3. I took the car to the dealer but they were unable to find the cause.

- St. Louis, MO, USA

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,

- Birmingham, AL, USA