Attached Files. Vacuum Diagram.pdf (116.0 KB, 3179 views) Reply Like. A4 (B6 Platform) Discussion - 3.0 Vacuum line problem - CEL came on. Looked at vacuum hoses and noticed one that wasn't connected to anything. It's the one hi-lighted with yellow. It's located in back of the 3.0 and descends down behind the engine. What to look for when buying a Audi A6 2011 - 2018, covering common problems to check for and overall vehicle reliability. 2024 Audi A6 Avant e-tron revealed: price, specs and release date Haldex is used by Audi on the quattro versions of the Audi S1, Audi A3, Audi S3, and the Audi TT. It is also used by Volkswagen in the 4motion versions of the Mk4 and Mk5 generations of Volkswagen Golf, Volkswagen Jetta, and the Golf R32, Volkswagen Sharan, 6th generation VW Passat (also based on the A-platform) and Transporter T5. On the Audis Overall Reliability. NA. We expect the 2024 Q7 will have about average reliability when compared to the average new car. This prediction is based on the 2021 model, plus the Audi brand scores. The Share. 1 / 1. Q7 MK 1 Discussion - Audi Q7 3.0 TDI cold start problems - I have seen many discussions on the problem of TDI engines being hard starting after say 12 hours , i found on another forum that the injectors need a back pressure of 10 psi to work , normally this is held by a valve after engine stop , but this valve can 2008 Audi A6 3.2 Quattro Engine Problem. I recently purchased a 2008 A6 3.2 Quattro with only 38k miles on it. The car is in very good condition. But just one week after my purchase i was experiencing some problem with ignition. Usually i have to crank it a few times for the car to start and there seems to be a fairly big acceleration lag What are the specific Audi A4 B8 2.0 TDI problems? Specific Audi A4 B8 2.0 TDI problems include water pump leaks and failure, leaking fuel injectors and excessive oil consumption. If the car has a manual gearbox, early failures of the dual mass flywheel are to be expected. Audi A6 Allroad Quattro estate (2006-2011): owner reviews 3.0 TDI Quattro. Year. 2009. Avg annual mileage. 10,000 – 14,999. mostly good but problems with front & rear sensors, washers nAEK6.