Audi Idle control valve Up for sale is a Working, in excellent condition Audi V8 Idle Control valve. VW/Audi part number 0 280 140 554 077 133 455C   455-C . This Idle valve should fit some Audi A8 & S8 V8 Quattros Models, however as always your best bet is to match the part numbers off your original unit with the part you need. These often get "stuck" at the hot idle position which will cause the car not to idle when ever it's cold, but perfectly fine when warm. some other faults can be noted by a very lumpy idle, or a car that idles extremely fast almost all the time except when cold, or a car that won't maintain idle during load changed - like the rad fans coming on, or AC coming on, or dropping into drive.