Hi guys, had a suspension fault light up on dash this week, normal ride only, popped car into local garage who I happen to know the boss and gave me free code reading check, the fault cade which appeared on the computer is as follows, C1A20-64, pressure increase too slow when filling reservoir, signal plausibility failure, any ideas guys what and where to start checking first before getting it checked over at dealers, copy of read out in gallery,, thanks guys

Bust compressor dryer cap, most likely

Thanks Disco_Mikey, Had a quick look this morning removed compressor plastic cover to exposes the compressor and with spray bottle and soapy water found that there is a leak in-between the red and blue 6mm push in fittings, it would be a cheaper fix just to buy the end cap but looking at the state of the compressor it may be that trying to remove the pins would be nightmare, i may as well bite the bullet and by new compressor, the part number on the pump is as follows RQG500080, would this be the an a Hitachi pump, or is there an alternative one which would fit, [/list]

The cap is available from a popular auction site for £30 or so.
However, the compressors tend to last another 6 months or so after fitting

You can replace with the original Hitachi, the cheaper Dunlop, or the superior AMK, the latter of which requires a software update to work

I only fit the AMK units now, they have proven themselves to be fairly reliable

hi guys changed compressors today after finding the old one had split on end cap and split on opposite end, fitting new one got rid of fault code but I need to ask question regarding compressor heat, when removing old one I had to cut the pipes which I could remove from old push fit connectors used some straight connectors to connect back to the new one, and connected nylon pipes to compressor, but after around 5 mins of testing compressor I noticed how hot the new compressor was and it stated to make the directly pipes soft, should the compressor get this hot or is there another fault, thanks guys

Hi-

I'm having the same issue, except my 2012 RRS has an AMK compressor.
"Reservoir taking too long to fill".

Are there ways of checking the AMK compressors and the actual reservoir itself?