Hello guys. I recently change passenger air strut. Had problem inflating but i loosen front line to left front shock drain down and cranked again an it lifted car even. But now i have another problem in dash reads apply foot and park brakes/ check pressure spare tire. I never replace tire with spare. I read about inflate tire higer than requied. And help wood be appreciated. I have a 2007 jaguar XJ8L 100.000 miles on it beautiful car

 

Could be battery in the sensor going out, they are 14+ rears old

 

I suppose you unplugged batterie before airstrut exchange
so it would be normal to have to push footbrake and the apply handbrake holding a couple of seconds.
As well roll dow window , roll up and holding the actuator a 6 seconds when closed and to do that on every window .
then your radio code will be asked as well

 

I guess yours has tire inflation sensors . Cant help you with that.
-4,2 bar is generally used on emergency narrow spare tire/.4,2 when in use
-3,0 for normal spare tire and /around 2,3 when in use