View all 115 consumer vehicle reviews for the Used 2004 Audi S4 on Edmunds, or submit your own review of the 2004 S4. I owned 328i BWM for 5 yrs I did not have any problems until around 100K 3 Review (s) $3,799.95. Driveshaft Center Support Bearing Carrier Upgrade for C5 C6 C7 A6, S6 & RS6 and A7, S7, RS7 and B5 B6 B7 B8 A4, S4, RS4, A5, S5, RS5. This four piece design does not require removal of the driveshaft and NO CUTTING. EASY INSTALL. The engine can turn off again when the conditions for Start/Stop mode are met. Watch your display for the Start/Stop system icons, they will tell you if the system is allowing or preventing it from working based on all the above. B9 S4. 12-13-2017 06:07 AM #14. B6 2004 Brilliant red 4.2 V8 S4 ( currently under the knife ) Common B7 A4 Problems/Issues & Solutions Audi FSI Engine Carbon Build-up Thread for B7 A4 2.0T/3.2 Find the most common issues based on car owner complaints. Get Your Car Fixed. 2019 Audi A4 problems (0) View all. 2020 Audi A4 problems (0) View all. Get back on These are some of the most common alerts of control module failure. Fuel efficiency changes. Uneven or difficult acceleration. Hiccups in engine timing. Misfiring or stalling. Dashboard warnings illuminated (especially the check-engine light) While these are common signs of control module failure, especially the PCM, these symptoms can also togatown. I am considering purchasing a 2012 s4 with a 3.0 v6 supercharged. An import mechanic I was speaking with said to be cautious about the v6's as they tend to present spendy issues. He mentioned camshaft replacements, and other issues where remediation requires engine removal to solve the failure. However he used examples of cars before I bought a used 2007 audi s4 with 103,000 miles for $16,000 with dealer maintenance records. the timing chain change and water pump done at dealer in records so seamed like safe bet..kinda wrong. Ten thousand miles into owning it came my first problem. Power steering line just sprung a hole and leaked out fast. Re: b6 s4 \ burning oil. These cars can use oil excessively, Audi is aware of the problem but doesn't seem to want to talk about it. Mine had the same problem every 4 to 5 tanks of fuel oil light, this is approx 1.7kgs of oil use. Solution so far for mine was a new short block ($12k cdn). Re: How do i diagnose bad n75 valve?? if your looking at the valve there are 3 vacuum hoses going to it. unplug the one on the top and test drive it. DO NOT GO WOT! make sure you keep an eye on the boost cause your wastegate will not open. Unitronic stage 2, 3 inch turboback, Stasis SS coils zIZw.