If you want a used Audi S4 in mid October 2026, the first decision is supercharged or turbo: 2010-2016 B8 and B8.5 cars use a supercharged 3.0-liter V-6 and could be had with a six-speed manual, while 2018-2025 B9 cars use a turbo 3.0 with an eight-speed automatic only. Shop a B8.5 with cooling and S tronic records, or a B9 with every air bag and rear axle campaign closed, and run the VIN before you trust the "Premium Plus" in the ad.
The S4 is a sleeper, which is half the appeal and half the problem. It looks like an A4 to a casual buyer, so a car with a stage 2 tune, a warning light history and two owners who skipped transmission service can sit on a lot priced like a clean one. Calling it an A4 with more power undersells the maintenance bill.
B8, B8.5 or B9
PistonHeads' B8 buying guide calls the supercharged V-6 generally reliable but lists the weak spots plainly. Early cars had water pump and thermostat trouble, and thermostats could stick closed. Slow coolant loss can trace back to the oil cooler. Engines built after mid 2012 got a lower-pressure PCV valve aimed at oil consumption, carbon buildup on the intake valves shows up as a rough idle, and the lower crank pulley on early cars could delaminate and wobble, with damage that can reach the crank. Engine mounts tend to break past 50,000 miles. The 2012 facelift brought electromechanical steering, and PH says some cars, mostly 2013s, wander or resist self-centering.
The S tronic dual-clutch gets its own warning in that guide: jerky or delayed shifts, clunks, hard downshifts, odd smells and leaks point to a failing mechatronic unit, and PH wants to see transmission service records every 35,000 to 40,000 miles. Manual cars avoid that box entirely. EPA's fueleconomy.gov S4 listings show a six-speed manual next to the seven-speed automatic for 2010, 2013 and 2016, and the supercharged label on all of them.
For the B9, Car and Driver lists a 349-hp turbo 3.0-liter V-6 with an eight-speed automatic and Quattro, a tested 4.2-second run to 60 mph, and notes that the S4 name is being retired as Audi moves the gas car over to S5 badging. EPA shows no 2017 S4 at all for the U.S. market, and the B9 years we checked are automatic only. So a "2017 S4 six-speed" ad is wrong about something, and you want to know what before you drive out to see it.
What vPIC says about the car
We decoded sample patterns through NHTSA's free vPIC tool on October 14, 2026. A 2011 WAUBGAFL pattern came back as an S4 "quattro Premium Plus" sedan with a 3.0-liter six, automatic, built in Ingolstadt. A 2013 WAUDGAFL pattern was also Premium Plus but listed a manual transmission, which is exactly the kind of field you want to match to the car in front of you. A 2018 WAUB4AF4 pattern returned "quattro Premium Plus, quattro Progressiv (Canada)" as the trim, and a 2023 WAUA4AF4 pattern decoded as a quattro Premium. The Canada trim note matters if a seller is vague about where the car came from. Our Audi VIN decoder guide explains the other positions.
Recalls worth checking by VIN
For early B8 cars, 15V-019 covers 2011-2012 S4s whose fuel injection system can leak; the fix was new fuel rails and seals. 14V-667 covers 2013-2015 A4 and S4 cars where, after the side air bags fire, a second impact to the front may not trigger the front air bags. That one was a software update, so it is easy to miss on a car that lived at independent shops.
The B9 list leans on the passenger air bag sensor. 19V-547 covers 2018 S4 sedans where oxidation on the occupant detection cable can disable the passenger air bag, and 21V-874 expands the problem to the seat heater connection on 2018-2020 cars. Then there is a chain. 21V-295 covers 2020-2021 S4s whose rear trailing arm lock nut can crack from stress corrosion, and 22V-034 exists because some cars repaired under 21V-295 never got their rear alignment checked afterward. If the car had the first fix, ask about the second. Our Audi recall check by VIN walkthrough shows how to confirm both.
Tunes, warning lights and the title
Tuned S4s are common, and PH notes a stage 2 B8 with pulleys can make well over 400 hp. A tune with receipts from a known shop is one thing. A tune nobody will talk about, a fresh battery disconnect and a dash with no lights on is another, and we would scan the car for stored codes before going further. Recall and decode tools will not show a salvage brand, a flood title or a rolled odometer. CARFAX says its reports cover title, odometer, ownership and accident data, so pull one on the exact VIN, not a screenshot from the seller.
Through us in mid October 2026, a CARFAX report is about $5.50 as a guest or about $4.50 as a member, and a CARFAX plus AutoCheck bundle is about $6.75. Retail tends to sit around $39.99 to $44.99. Confirm at checkout because pricing changes. We are a licensed CARFAX and AutoCheck reseller and are not affiliated with CARFAX, AutoCheck, or Experian.
If the S4 is more car than you need
A lot of people start here and end up in a regular A4 once they price S tronic service; our used Audi A4 buying guide covers that route. Car and Driver positions the S4 as a calmer rival to the BMW M340i, and our used BMW 3 Series buying guide is the place to compare.
Comments (0)
No comments yet. Be the first to share your thoughts!
Log in to leave a comment.