Ok guys so the RR has been behaving itself right up until we decided to go for a short break, just before we went away it went into limp mode whilst towing, a quick diagnostic showed map sensor A, so cleaned them both and swapped them over since I didn't know which was A, then twice whilst driving around after we got to our destination it decided to go into limp mode again, this time whilst going up fairly steep long hills, again showing Map sensor A.... So I'm guessing that it's not the sensor, last time this happened several years ago it turned out to be one of the four short manifold hoses. I've just been under the bonnet took the engine cover off and the pollen cover off, I can't find any misting on any pipe work or the rocker covers.
Could it be caused by one of the upper intercooler hoses if there well worn, I can't find any obvious holes but there's lots of cracks both outside and inside both pipes.
Also is the anyway I can get to both turbo actuator rods and move the by hand (to check they move freely) from the engine bay, or do I have to jack the car up and remove the wheels and liners to get at them, all work will be done on the drive.
Thanks for any advice as always
Tiprat. Borrowed Grey 2002 3d 204k for a year
Now own a 2007 Java black Vogue SE 3.6TDV8 160k

I should also put on this post that it showed that the gearbox functions were unavailable…..a message appeared on the stereo screen and the driver’s dashboard.
Can the gearbox fault put it in limp mode and is there anything I should look for?

Regards
Tiprat Borrowed Grey 2002 3d 204k for a year
Now own a 2007 Java black Vogue SE 3.6TDV8 160k

Certainly sounds like intercooler hoses.

Any smoke ?

Up hills, towing & accelerating are the usual times to go into limp mode, but usually with some black smoke out of the exhausts too.

NMJ figured out a quick fix if it might be those - it's here