I purchased used 1996 jaguar xj6 and the ONE key does not work the door locks and it did not come with a remote. I thought if I got a remote that would take care of the problem of not being able to lock the doors, BUT I don’t know if I need the 315 mhz or the 433 mhz remote I have emailed and asked various sellers and they each assure me that the one they have is the one I need but they can’t all be right!