1999 XJ8 with 85,000 miles turn the key and i get STABILITY CONTROL FAIL or something like -PECUS also came up. I haven't turned it on for a couple of days and when i did it dosen't start.
Everything works radio, dash cluster, headlights etc.
When i do try the other thing i get is SYSTEM CHECK.
If you have any ideas or suggestionsi appericate them thanks-

 

All i hear is a click when the key is turn then the error code STABILITY CONTROL FAIL comes up right after... some electrical things seem to be acting up also// alarm sounding on a low pitch, the door lock need to hit the remote button a few times before it locks, then the sound it makes onced locked a real low beep.
not sure if it has anything to do with itor multiple problems.

Thanks for the help sounds like i'll need to get a JAG tech over here!

 

Drog: Regarding your slow speed stalling problems - my '99 XJ8 did the same thing. My mechanic performed a fuel injection system cleaning and replaced the fuel filter, but the problem persisted - and got worse as time went along. Acting upon the advice of a fellow poster here I checked the throttle plate and found it covered with tarry deposits. I bought a spray can of B-12 Chemtool throttle plate cleaner (around $2.50 at most auto parts stores) and fixed the problem. Other causes can be a bad MAF sensor or a problem with the throttle body itself. A local Jaguar tech told me there are "a lot of issues" with Jaguars and the fuels sold in the US. I was advised to skip the cheap stuff and run either Shell or Chevron gasoline.

One tip: When cleaning the throttle plate, use a cloth instead of a paper towel. The spring on the plate is very strong, and if you use a paper towel the throttle plate could close and tear off a piece of the paper and drop it into the intake.

Since cleaning the throttle plate is easy and cheap, start there and see what happens. All you need is an 8mm socket to remove the two retaining bolts from the plenum cover and it lifts right off to give you access to the throttle plate. It took me about five minutes to clean mine because it had a lot of deposits on it. Since I performed the cleaning the car has not stalled, and a little "hitch" the car once had when I pressed the accelerator has disappeared.

 

I've changed the battery negative then postive // postive then negative when it put it back on cleaned the power studs had some corr. on them put the vent tube back on since turn the key no more STABILITY CONTROL FAIL error code.sounds like itwants to start up but still dosen't.
I'll check the throtle body housing since in the past it has been replaced.

Again thanks for all the suggestions and help it's appericated-

 

When you clean the throttle plate, make sure to hold it open a bit. You may have some deposits on thesides of the throttle opening that won't be cleaned off if you just spray it with the throttle plate closed. Mine had deposits on the leading and trailing edges of the throttle plate that extended onto the throttle opening. If you don't clean the sides of the throttle opening your throttle plate may still stick.

 

Thanks for the help jag genius that's all it was. The car is starting up. Thanks for looking out-