I've been getting similar problems with my FL S8 since October. I've change many things including the MAF, throttle body, lambda probes but was still getting the same problems, i.e. ABS and traction control lights coming on. However, it would appear the problem causing my issues turns out to be air leaks. I thoroughly checked the entire induction system and found leaks in the rubber elbows connected to the MAF and the throttle body. These were changed. I also noticed one of the bolt holes for the throttle body in the inlet manifold had stripped so I had this hellicoiled. Well, I wanted it hellicoiled but instead the machine shop drilled out the hole, inserted a brass insert then drilled and tapped this. Unfortunately, the insert must have been slightly proud of the surface so they got a file and filed it flat - putting a groove in the surface where the throttle body fits. (I live in Dubai and the cowboys over here make the cowboys in the UK look like good, honest professionals). The throttle body is now no longer perfectly flush with the mating surface on the inlet manifold which means I will have to try and find a quality machine shop to skim that surface to get it perfectly flat(difficult in Dubai) or get a new inlet manifold. (Expensive).
Can I suggest you check, if you haven't already done so, your entire induction system from air box to inlet manifold Remove the throttle body and give it a thorough clean with carb cleaner. Refit using a new gasket. You will need to do a throttle body adaption after refitting but that is simple with VCDS.
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2001 D2 S8. Volcano black. KW Variant 1 coilovers. EBC Turbo grooved discs with Yellow Stuff pads. 19 inch R8 replica wheels with 255/35/19 Michelin Super Sport. In the UK, 1990 Audi 90 2.3 20v Quattro with just 65,000 on the clock and in mint condition.
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