Quote:
Originally Posted by harvmiester17
Hi, I've just joined here so I hope you don't mind me buting inn. I may be able to she'd some light on the problems you are facing. I own a Cayenne, Touareg and Q7 specialists in Newcastle and I have come across these codes many times and they are 90% of the time down to the compressor. It's made by Wabco and is used in nearly all the luxury cars produced in Europe and its biggest flaw is the piston ring in the compressor. Normally the fault appears after sitting over night, a short time after you start driving a fault will show on the dash as the compressor tries to refill the system.
The piston ring wears over time and allows blow by, the poor motor is working so hard to fill the system it overheats and shuts down. The old piston ring is made of fibreglass but the new one is a carbon composite so doesn't wear as quickly.
First thing you need to do is stop running tests on your system until you have repaired the compressor or you will be buying a new one, the motor will only put up with so many overheats and simply stops altogether. When you have removed the compressor housing from the car you will need to take your time with removing the bolts as they are held in with Locktite! If you round the bolt, Irwin tools do extractors which lock on to the damaged head as you turn it. Carefully heating the bolt also helps to burn away the Locktite. Once the bolts are out it's a simple job to overhaul the pump. Clean the cylinder wall with brake cleaner. Do not use any lubricant (the pump is dry running), replace the piston ring making sure the taper is in the same direction as the old one, replace the rubber seal and reassemble the housing.
If done properly this repair will last for years and solve a lot of problems on the air suspension.
Hope this helps.
H
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Very very interesting 
Thanks for the info, valuable lesson for sure 
Very quick question, do you know is compressor could be related to VCDS lowering problems as well?? I can go -15mm at the front and -10mm at the rear, but below that it wont let me anymore, it errors me when calibrating at the end, usually after entering values for the front axle and switching to rear axle??
I will be doing this rebuild anyway next time I've got the bumper off
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten
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