4.8 Air Suspension issues, EHC 74 code and compressor won't switch on

[Leicesterboy15]

Originally Posted by Paulpen

From a quick look (im at work) the reservoir pressure screams you have a leak or a dead compressor to me.

It could be but it would need to be a generic leak as all 4 corners dropped at the same time. When I first replaced the compressor the pressure was at 13.8 bar but every time I cleared the error and the compressor tried to kick in I could hear it releasing are through the gold valve on the compressor, this happened about 5 times until there was no pressure left to release.