You need to get to the bottom of what your system is doing.
You can check the output Pressure in Bar of the pump by using the modified VCDS labels provided by Del HERE
That will let you test the output of the pump with VAGcom (should be 15 or 16 bar) and tell you how badly or ok it is performing. Mine was putting out only 7.8 bar despite having recently had the bagpiping andy seal kit fitted as a pro-active attempt to keep it ok. The pump tries to put enough pressure out to properly deal with raising and lowering the car and when it cant it runs and runs then overheats and cuts out when it gets too hot and that causes an amber warning light.
Fitting a new air suspension compressor cured my issues (cost £280 less £25 refunded) and I am currently negotiating a deal for anyone with a D3 onwards to supply an OEM matched new pump from my supplier and to take back old ones for an additional credit. I will update all when completed. 
__________________
Confidence is the feeling you have before you know better . . . . 
Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange
2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee
20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble 
Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior
Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble
Audi A8L D2 4.2 Petrol with LPG - Ebony Black
Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black
Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior
and some other A8's A8L's and Mercs
|