Warning lights come on and the car goes to limp home mode-car has been local jaguar dealer 3 times in last month-lots money spent on resets-plugs and coils-throttle box

Bad battery, or bad ground. If thats not it put a code reader on it while its running in limp mode and see what she says.

The only time a vehicle goes into limp mode is when there is ****** problems, so I would take it to the ****** shop for code retrivel and if I am not wrong there might be problem with the Input/Output speed sensors BUT do have it checked first.

Having a restoration shop and running several newer Jaguars I have seen similar situations. Intermittent multiple errors such as these can be caused by a low battery (or corroded connections) that "fool the computers". Also had a '99 XJ8 VDP have exactly the same issues over several months. Issue was a manufacturing fault in the sensors on the throttle body that caused the "limp home" mode - usually in stop and go traffic. Jaguar had an inspection and recall on the throttle bodies but that vehicle had gone through 3 different Jaguar dealers for service and none looked at TSB/Recall or performed the necessary checks on the throttle body. Tried cleaning the throttle several times (per Jaguar TSBs) but no change. Had to replace throttle body & problem solved (over 30,000 miles since then). Recommend making sure all air connections to throttle are clean and open and cleaning the throttle area to see if that helps.

On newer Jaguars (and other Al bodied cars) similar problems occur when the "ground" connections to the body become poor (usually through corrosion but sometimes through collisions). Connections may look perfectly normal but have high resistance. Careful when working with the connections - the posts are usually very loosely fastened to the bodies. Good luck.

the best thing to do is to have the car scaned with the diagnostic computer to see what fault codes are stored.
acording to the fault code you'll be able to work out what's wrong with it.
I'm sorry i ca't be anymore helpfull.

MOST TIME LIMP MODE MEAN ECM FAILING IF YOU CANT ERASE OLD CODE AND REPROGRAM ECM. AND IT CANT RELEARN NEW PART ECM HAS A MEMORY FAULT.

These boxes rely on electronics and hydrualics.... the gearbox has internal electronics and external, in the form of a control unit(computor) that also gets lots of information from other control units on the car... does it just stay in one gear?, if so is probably in a "limp home mode".... sorry but this is a dealer diagnostics job or and internal failure of a mechanical/hydraulic part within the transmission...... Steve.... Botswana

theres a solenoid that selects gears it can trick the gearbox into limp mode, id have that checked before spending big money i spent 6000 on a new gearbox (not standard price i had a heavily modified gearbox) because the standard gearbox did the same turns out it was an $80 solenoid, i found out after forking out the money. any ford dealer should be able to plug it in and run diagnostic checks for you

Sorry late reply - just seen this problem. The amber warning is basically saying a problem developing. The red and limp home action is showing more serious developement - But not always very bad news. Had car with same symptoms and it was a faulty sensor on engine, and another similar case was throtle position sensor. Get the car to a garage that can read the faults - so you know what the problem is that has been registered in the memory.
Hope this helps

look at your wheel speed sensors in the back ( this is where I would start)

This is likely a wheel sensor problem, which when it fails, the car goes into a limp mode. Allowing you to drive it safely until you can get it repaired.