Hello
Gets alarm for suspension fault. Diagnose tester shows fault C1A20-64 "Pressure in creases too slow when filling reservoir".
The car do not lower it self during a 24 hour period of parking, so no leaks there. With the diagnostic tester I can follow the gallery pressure.
When the car is started the pressure goes from 160 to 1600 kPa (1,6-16 bar) rather quick. When compressor stops the pressure drops as quick as it raised.
I am a little confused here, if gallery pressure is the same as reservoir pressure. I don't think the compressor is able to raise pressure i reservoir so quickly and I think if reservoir was leaking so much as the pressure drop indicates, I would hear it easily.
So what is going on ? Is it the compressor unit or reservoir valve blok which are faulty

Thanks for any qualified answer.
??????
Edit 10/5
Since no experts around. I am going to buy a new compressor unit and see if that do any good. It just seems that there are no volume in the system. since the pressure can go up and down so quick. On the other hand the fault C1A20-64 indicate a poor compressor ???? Could acess to reservoir be restricted ? Compressor interial leaking ? Reservoir full of water ? can that happen
Any good advice

Regarding buying a new compressor unit. Aftermarket compressors offered on e-bay. are they any good ?

I recently overhauled my 2010my compressor with a kit off eBay for total of £75, was not hard to do as long as you have some technical knowledge 👍🏻

Do you recommend overhaul of the original one instead of buying a new aftermarket. ?
These aftermarket, probably China made, Are they OK ? It's half price to OEM

I’d rebuild with a kit if you have the time and patience. 2012 5.0 SC AB
Mods:
TPMS
Genuine LR DRLs
Remote Boot close from key fob
2016 Discovery 4 Mirrors AKA RRS2
2014 L405 Surround Camera retro fit (WIP)
2013 RRS Dual View Screen fit (Complete)
2016 LR4 RSE
2014 LR4 Homelink
2016 FFRR Electrochromatic Wing Mirror Glass

70 plate Focus ST (Current)
1942 VEP Ford GPW Jeep (Willys) (Current)
1943 Whites M16 Halftrack (Current)
16 plate Eurofighter Typhoon, 2 x Eurojet engines with 20,000lbs thrust each. 1380mph

Re build is probably best, could advise you of how I did mine etc if it helps👍🏻