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Originally Posted by a8 tech
Whats the mileage,i bet its 40,000 miles plus.Possible cause without fault code or mil light,egr sticking open or tandem pump pressure loss.Disconnect egr valve vac pipe and try that.WARNING LIGHT WILL COME ON.
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Why recommend doing something that will actually bring on the engine management warning light. This will only mean the OP will then HAVE to go to either an Audi stealer, or an Indi, or someone with VAG-COM to clear the codes !!!!
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Sean - Independent Motor Vehicle Technician (retired)
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'07 Audi B7 RS4 quattro saloon 4.2 FSI V8 32v (BNS) (with ceramic brakes) - WOW
'06/7 VW A5 Golf Mk5 GTI 5dr 2.0T FSI (BWA) DSG, fully loaded, colour coded, 
'98/9 Honda CBR600FX, the blueberry trifle 
'03 Audi B6 S4 quattro saloon 4.2 V8 40v (BBK) 6sp manual, fully loaded (gone, but not forgotten)