Explain further “I can’t start the car”.
Will the key turn?
What happens when you use the other key?
If the key turns to the first position, lighting the normal lights, but then won’t crank the car, that is usually the transponder unit.
Is the key is acting like it is the key to a different car, where it won’t turn at all?
Interesting, not a common problem. Here is the diagram I was using chasing part that might be needed a few days ago. #6 or #7 are different barrels cut to key number or with a key, both NLA.
That page from the EPC covers the early and late car. The car changes at M45255, which is called 2003 model year in US and is listed in Jag references as 2002.5 and later. They don’t change the picture but the part numbers change. Hard to tell what changes in the ignition lock even though the dash was changed completely in appearance.