Hey there ive been using my p400 2021 for a around a month now and i faced that problem High idle ( 900rpm to 1100rpm ) on neutral or park while A/C is on
Is that normal ?

 

It could be.
Different vehicles will have slightly different parameters. If it only does it with the AC on I would say normal.
Has it done that since new?

 

i didnt notice it to be honest but after the weather started to get warmer i saw the rpm is high while the a/c is on when i turn it off it goes back to normal + when the rpm is high the fans on high speed
+ land rover said its fine when i took it to them

 

A lot of vehicles will kick the idle up just a bit with AC on because the engine is turning the AC compressor and that creates more heat. Kicking the idle up runs more coolant through the motor faster to keep the engine cool and keep your electrical system positive.
Plus in neutral and park there is no load on the engine.
I dont *think* its anything to worry about.

 

I checked mine, 2020 P400 and the idle sits at about 750rpm's regardless of gear P, R, N, D. I hadn't run it very long as it's not very warm out yet.

 

Probably normal, although too cold here to test my AC yet. Our LR4 idles higher when the AC is working hard then idles even a little higher if the radiator cooling fan kicks on.