The 2017 S7's 4.0T V8 is a high-strung twin-turbo masterpiece that demands meticulous maintenance, but catastrophic engine failure from carbon buildup on piston rings remains the elephant in the room—a problem that can brick an otherwise excellent grand tourer.
Catastrophic Engine Failure – Carbon-Induced Piston Ring Seizure
Occasional · high severity
Typical onset: 60,000-90,000 mi
Symptoms: Excessive oil consumption (1+ quart per 1,000 miles), White smoke from exhaust on cold start, Check engine light with misfire codes (P030X), Severe loss of power or sudden engine seizure
Fix: Carbon buildup on intake valves migrates into cylinders, seizes piston rings, scores cylinder walls. Requires complete engine rebuild or short block replacement. 30-45 labor hours for removal, rebuild, and reinstallation. Often discovered too late to salvage block.
Estimated cost: $15,000-25,000
Turbocharger Wastegate Rattle and Failure
Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Rattling noise on cold start for 3-10 seconds, Loss of boost pressure under acceleration, Check engine light with underboost codes (P0299), Audible fluttering or chattering at idle
Fix: Wastegate actuator arms wear and rattle inside turbos. Early stages are just noise; later stages cause boost control issues. Requires turbocharger replacement (both turbos recommended). 12-16 hours labor with exhaust and manifold removal.
Estimated cost: $4,500-7,500
Transmission Oil Cooler and Thermostat Failure
Common · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Harsh or delayed shifts, especially when cold, Transmission temperature warning light, Limp mode activation (limited to 3rd gear), Fluid leaks near transmission bell housing area
Fix: ZF 8-speed transmission oil cooler thermostat sticks closed, causing overheating and accelerated clutch wear. Requires cooler/thermostat replacement and often a transmission fluid flush. 6-9 hours labor with undertray and front subframe loosening.
Estimated cost: $1,800-3,200
Carbon Buildup on Intake Valves
Common · medium severity
Typical onset: 50,000-80,000 mi
Symptoms: Rough idle and misfires at startup, Hesitation or stumble during acceleration, Reduced fuel economy (2-4 mpg drop), Check engine light with multiple misfire codes
Fix: Direct injection with no port injection means zero fuel washing over valves. Carbon accumulates heavily by 60k. Requires walnut blasting of all intake valves. 8-10 hours labor with intake manifold removal and plenum access.
Symptoms: Clunking when shifting from Park to Drive/Reverse, Vibration through chassis at idle in gear, Excessive driveline shunt during hard acceleration, Visible transmission sag or misalignment
Fix: Hydraulic transmission mounts, particularly the rear mount, fail from heat and stress. Creates driveline slop and harshness. Rear mount replacement requires subframe drop or partial lowering. 4-6 hours labor.
Estimated cost: $800-1,400
High-Pressure Fuel Pump Failure
Occasional · high severity
Typical onset: 70,000-110,000 mi
Symptoms: Extended cranking before engine starts, Random stalling at idle or during deceleration, Severe loss of power under load, Fuel pressure fault codes (P0087, P0088)
Fix: High-pressure fuel pump (driven off camshaft) wears internally, starving engine of fuel under load. Can leave you stranded. Replacement requires camshaft cover removal and timing alignment precautions. 5-7 hours labor.
Estimated cost: $1,500-2,500
Owner tips
Run Top Tier fuel exclusively and consider periodic fuel system cleaners to minimize carbon formation—though nothing truly prevents it on direct injection motors.
Walnut blast intake valves every 50,000 miles as preventive maintenance; waiting until misfires appear means damage may already be starting in cylinders.
Monitor oil consumption religiously from day one—anything over 1 quart per 2,000 miles is a red flag for impending ring failure.
Change transmission fluid every 40,000-50,000 miles despite Audi's 'lifetime fill' claim; ZF 8-speeds don't tolerate degraded fluid.
Keep detailed service records and push for extended warranty coverage if buying used—engine replacement costs exceed many vehicles' resale value.
Buy only with comprehensive records proving carbon cleaning and oil consumption monitoring—otherwise you're gambling $20k on an engine time bomb in a spectacular chassis.
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 for start-stop system; located under trunk floor
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Every control module on the 2013-2018 Audi S7 — 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.
⚠️ Memory positions lost on replacement; reprogramming via user interface
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
3.9sec
Quarter mile
12.3sec
Top speed
155mph
Fuel economy (EPA)
City
17mpg
Highway
27mpg
Combined
21mpg
Fuel
Premium Gasoline
Capability & size
Curb weight
4,497lb
EPA class
Midsize Cars
Wiper blades
C7 generation S7 Sportback, technically a 5-door hatchback but sedan-like profile with no rear wiper
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 S7 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.