The 2017 Audi S6 with its 4.0L twin-turbo V8 is a stunning performer, but catastrophic engine failures due to defective piston rings plague early examples of this EA824 engine. When they fail, you're looking at a full rebuild or replacement—this is the dominant concern overshadowing all else.
Catastrophic Piston Ring Failure / Engine Rebuild Required
Common · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Excessive oil consumption (1 qt per 1,000 mi or worse), Blue smoke from exhaust on cold starts or acceleration, Misfires, rough idle, loss of power, Check engine light with lean codes or misfire codes, Eventually catastrophic bearing failure if driven low on oil
Fix: Complete engine-out rebuild with all pistons, rings, bearings, gaskets, often crankshaft polishing. Many opt for factory short-block replacement. 40-60 labor hours depending on damage extent and whether turbos are serviced simultaneously.
Estimated cost: $15,000-25,000
Turbocharger Wastegate Rattle / Actuator Failure
Occasional · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Metallic rattling at idle or light throttle, especially when engine is warm, Reduced boost pressure / limp mode, Check engine light with boost control codes (P0299, P00BD), Turbo flutter or inconsistent spool
Fix: Wastegate flapper arm wears or sticks; actuators fail. Often requires turbo removal and rebuild or replacement. 8-12 hours labor per side, many do both simultaneously if one fails.
Estimated cost: $3,500-6,000
Transmission Oil Cooler Failure / Leaks
Occasional · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Transmission fluid in coolant (strawberry milkshake in expansion tank), Coolant in transmission (harsh shifts, slipping), Overheating transmission or engine, Leaks underneath vehicle near transmission bellhousing area
Fix: Internal cooler inside radiator or external auxiliary cooler develops leaks, cross-contaminating fluids. Requires cooler replacement, full fluid flush of both systems, sometimes transmission replacement if severely contaminated. 6-10 hours labor.
Estimated cost: $2,000-4,500
Transmission Mounts Collapsing
Common · low severity
Typical onset: 50,000-90,000 mi
Symptoms: Clunking or banging on hard acceleration or deceleration, Vibration at idle in Drive, Excessive drivetrain movement felt through cabin, Visible sagging or cracking of rubber mount material
Fix: Hydraulic and rubber mounts deteriorate from heat and torque stress. Replace all engine/trans mounts as a set for best results. 4-6 hours labor.
Estimated cost: $1,200-2,000
Carbon Buildup on Intake Valves (Direct Injection)
Common · low severity
Typical onset: 60,000-100,000 mi
Symptoms: Rough idle, misfires at cold start, Hesitation or stumble during acceleration, Reduced fuel economy, Check engine light with misfire or fuel trim codes
Fix: Direct injection means no fuel washing valves. Requires walnut blasting media cleaning with intake manifold removed. Preventive every 60-80k miles. 5-7 hours labor.
Estimated cost: $800-1,400
Fuel Filter / Fuel Pump Assembly Issues
Occasional · medium severity
Typical onset: 80,000-130,000 mi
Symptoms: Hard starts or extended cranking, Loss of power under load, surging, Limp mode or fuel pressure faults, Stalling at idle or during acceleration
Fix: Fuel filter integrated into in-tank pump assembly; cannot service separately. Requires fuel tank drop and full pump module replacement. 3-5 hours labor.
Estimated cost: $1,200-2,200
Air Suspension Compressor and Strut Leaks
Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Vehicle sagging on one corner or all corners after sitting, Compressor running excessively or continuously, Suspension fault warning on dash, Rough ride or bottoming out
Fix: Air struts develop leaks at seals; compressor wears out from overwork. Struts are 3-4 hours each, compressor 2-3 hours. Often multiple components fail together.
Estimated cost: $1,800-3,500
Owner tips
Check oil level religiously—every fill-up if consumption is present; this engine will eat itself if run low
Get a pre-purchase leak-down and compression test to assess piston ring condition; avoid cars burning oil
Walnut blast intake valves preventively every 60k miles to avoid misfires and carbon-related damage
Budget for turbos and mounts as wear items beyond 80k miles
Extended warranty is nearly mandatory given the engine failure risk—verify it covers internal engine damage
Only buy if engine has been rebuilt or short-block replaced with updated parts—unmodified high-mileage examples are ticking time bombs, and that $20k engine bill will exceed the car's value.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: AGM battery required; located under trunk floor; H8 alternate group also compatible
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Every control module on the 2012-2017 Audi S6 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Power seats with memory and massage. Two modules (driver/passenger). Coding for feature activation.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER · 22V178000
2022-03-23 · PE21009
Volkswagen Group of America, Inc. (Audi) is recalling certain 2013-2017 A8, S6 Sedan, S7, S8, and 2014-2017 RS7 vehicles. The turbocharger oil supply strainer can become blocked, causing wear to the bearings due to lack of lubrication.
Consequence: Worn bearings can cause the turbine wheel to contact the turbocharger housing or cause the shaft to break, causing an engine stall and increasing the risk of a crash.
Remedy: Dealers will replace the oil strainer and perform an oil change, free of charge. Owner notification letters were mailed August 4, 2022. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 21H7.
AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION · 18V370000
2018-06-04
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2013-2018 Audi S6 and S7, 2012-2018 A7 and A6 Sedan, and 2014-2018 RS7 vehicles equipped with basic seats (with or without heating). Stress or wear of the body-sensing mat within the front passenger seat may cause the Passenger Occupant Detection System (PODS) control module to malfunction.
Consequence: If the PODS module malfunctions, the front passenger air bag may not deploy properly in the event of a crash, increasing the risk of injury.
Remedy: Volkswagen will notify owners, and dealers will install a PODS system repair kit, free of charge. The recall began November 29, 2018. Owners may contact Audi customer service at 1-800-253-2834. Volkswagen's number for this recall is 74D5.
Performance
Horsepower
450hp
Torque
406lb-ft
0–60 mph
4.4sec
Quarter mile
12.8sec
Top speed
155mph
Fuel economy (EPA)
City
18mpg
Highway
27mpg
Combined
21mpg
Fuel
Premium Gasoline
Capability & size
Curb weight
4,387lb
EPA class
Midsize Cars
Wiper blades
C7 generation (2013-2018). Sedan body style, no rear wiper. Uses Audi push-button attachment.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2017 Audi S6 4.0L Twin-Turbo V8 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.