Originally Posted by
Kingdav1954
you have a speed sensor problem. If your car was an automatic it would be in limp in mode right now stuck in second gear. You're going to have to get into the repair manual available here on the Forum and do your homework.
Agreed, that's why I mentioned the conductor plate, but the OP's is a 6 speed.
( I have no idea where the speed is measured in a 6 speed XF )