Thank you for the information. Just bought a beautiful XK 2011. And she is having the same issue, and she had pretty much set for 2 years.

Great suggestion, thanks!  

Hi Steve, unless there is a fault developing in the steering rack, which is unlikely, I would jack up the front end and undertake the lock to lock reset with nil load on the front end to see if that makes any difference. If the steering position sensor goes, then the input feeling is very different. The turn in feels light and there is no self centring return, i.e. you need to manually rotate the steering wheel back to the straight ahead position. Whilst the front end is off the ground, check the play in bearings and bushes just to be sure. Otherwise, enjoy the wonderful world of Jaguar motoring. N6 JMX

I recently acquired a base V6 coupe (it does have a 6-speed manual if that matters). The car runs great but I do feel something isn't right with the steering.  Intermittently there is some stickiness to the steering when I turn left. When turning to the right (at any speed) it is smooth and linear. When I turn to the left, however, the steering seems hard and stiff momentarily when turning in off center.  After that it does seem to come back to normal, but it is disconcerting. I checked the normal basics like tire pressures, PS fluid (clean and full), and tire wear is even so it doesn't appear to be an alignment issue. I read somewhere that turning the steering wheel from lock to lock a few times in accessory mode can reset the steering position sensor. That wasn't easy since the car doesn't have power steering in acc mode, but I did it on a gravel road for less friction.  However, there was no change. Does anyone have any other thoughts about what could be causing this? Is it normal? Do I have an impending expensive repair to worry about? Thanks!

My car alarm started going off for no apparent reason.   After much investigation and browsing online, I was able to trace the problem to the passenger side read door when the fault went hard. The door closed micro switch not working giving a red light and details on the dash.  Eventually I found information online that showed the connections to the generic control unit under drivers side dash. The Green connector pin 15 is the signal wire from pax rear door. It was not going to earth when the door was closed.  My solution (to avoid replacing the door locking assembly) was to solder a wire to the wire going to pin 15 and connect it to earth(negative). Alarm is working normally and other 3 doors give open indications on dash.    My information gives:: Green pin 18 going to drivers side rear door. RH Rear door switch   Blue Pin  21 to bonnet sw   White Pin 21 to  LH Front door switch.   White Pin 22 to RH Front door switch. I hope this info helps someone but cannot guarantee info 100%   However it has sorted my problem