quit running means what, engine dead or is not dead but transmission is dead.???
they all do owned long enough, ALL DO.
JUST NOW FAILED?
STALLS HAVE OVER 50 CAUSES.! no point in listing all ever.
WE DO TESTS USING TOOLS AND SKILLS TO FIND IT
Gue$$ing is costly, so we get a shop to fix it, 99% do this way.
top causes are
neglect.
not doing tune/up service points on time and at mileage.points
spark ,parts, filters , belts and..fluids.(engine)
no engine told or VIN so specific answer will be impossible.
2 engines there. ,wow JAG
2003-2005
LS V6
2,967 cc (3.0 L; 181.1 cu in)
Jaguar AJ V6
2003-2006
LS V8
3,934 cc (3.9 L; 240.1 cu in)
Jaguar AJ-V8
The engine seems cam chain drive best i can tell and is good.