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Hi. Thanks for your question. For assistance on Jaguar xj8 performance you can visit https://www.reliable-store.com and download the entire workshop manual which includes all the information along with the diagrams for better understanding. Good day!
For the money you spent on another computer, you could have brought your car to a qualified mechanic and had the problem correctly diagnosed and repaired. 'Restricted performance' meant the computer saw something wrong in the engine, and restricted the performance to keep from destroying the engine. You killed the messenger and still have the same problem.
The red light is for warning the amber is for caution so your caution light is on thats the amber the amber is reserved for local market like brake pads,oil change,or abs that affects steering stability, The information is exclusive only your driver handbook will define it
You need to take to Jaguar technician to have Mil lamp codes read and cured the restricted performance is the engine protecting itself as there is a fault in the management system,usually fuel system related,It has gone into "Limp Home" mode to try to limit the damage done untill the fault is cured
o2 sensors often cause a rough idle at stand still. Previously my xj8 had crank case ventilation (pvc valve essentially) issues that caused the check engine w/ restricted performance. I noticed a severe drop in gas mileage as well. Jaguar dealer fixed my problems in a few hours and it was surprisingly cheap. Its worth taking it to advanced or auto zone to see what the computer says. Then decide if you want to shell out for a dealer fix or if you can tackle it yourself. BTW, just to justify myself this is my third jaguar. I have a '94 xj6 with a chevy 350 inside it, previously owned a 95 XJ6 and currently have the xj8. They are wonderful cars if you can put up with their rough times.