Recently after running the car for 2 or 3mins i get the yellow suspension warning on the dash
Range Rover Sport HSE V8 4.4L 2006 model

took it to the mechanic shop and on the computer screen it says:

C1A20-64: PRESSURE INCREASES TOO SLOW WHEN FILLING RESERVOIR.
signal plausability error

he's not the best mechanic with the best experience and he's claiming he needs to change the air supenion compressor unit and it will cost around $1,000

wanted to check if anyone has an idea about this or been through this before

hi i have just had the same thing on my sport,
same symptoms and same steering wheel on the dash the only thing that cured it was a new compressor pump
as it took ages to pump up the vehicle
regards
clive

If the compressor can be heard running (trying to fill up the air reservoir) sometimes the fault can be the exhaust valve on the compressor block I believe. This will relieve pressure if stuck open so could be why its taking a long while to pressurise the reservoir. And a far cheaper repair.

Good luck. 2007 RRS TDV8 Stornaway Grey with lots of smiles..
2007 Audi A4 2.0T Cabriolet

Missing - 2008 Suzuki GSX-R 750

C1A2064
Pressure Increase Too Slow When Filling Reservoir

 Compressor fault
 Reservoir pipe air leak
 Reservoir air leak
 Gallery pipe air leak
 Intake filter blocked/restricted
 Intake pipe blocked/restricted
 Air suspension intake silencer blocked/restricted
 Corner valve stuck open
 Pressure sensor fault

Refer to the guided diagnostic routine for this code on the approved diagnostic system.
Check the Air suspension intake pipe and silencer for blockage/restriction Malaysia Boleh!
4.2SC Chawton White, Stormers
Tasmod's Sills, Wind Deflectors, LR Sills
Clear Side Repeaters, Towbar
Larini Sports Exhaust, K&N Air Filter
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I knew Bobby would save the day  2007 RRS TDV8 Stornaway Grey with lots of smiles..
2007 Audi A4 2.0T Cabriolet

Missing - 2008 Suzuki GSX-R 750