The 2011 Audi S5 with the 4.2L V8 is a high-strung performance coupe that rewards meticulous maintenance but punishes neglect with catastrophic engine failures. The naturally-aspirated FSI engine is notorious for carbon buildup and oil consumption that can lead to piston ring failure and full engine rebuilds if not addressed early.
Excessive Oil Consumption Leading to Piston Ring Failure
Common · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Burning more than 1 quart per 1,000 miles, Blue smoke on startup or under load, Low oil pressure warning, Misfires on multiple cylinders, Carbon deposits visible in intake ports
Fix: Audi extended warranty covered some cases, but post-warranty you're looking at engine-out piston ring replacement or full short-block replacement. Rings alone: 30-40 labor hours. Full short block: 35-45 hours including fluids and timing chain service while it's apart.
Estimated cost: $8,000-15,000
Carbon Buildup on Intake Valves (Direct Injection Issue)
Common · medium severity
Typical onset: 40,000-80,000 mi
Symptoms: Rough idle, Hesitation or stumble on acceleration, Misfires (P0300-P0308 codes), Reduced fuel economy, Failed emissions test
Fix: Direct injection means no fuel washing over valves. Walnut blasting the intake ports is the proper fix—requires removing intake manifold. Takes 4-6 hours for a V8. Preventive every 50k miles is wise on these engines.
Estimated cost: $600-1,200
Transmission Oil Cooler Lines Leaking
Occasional · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Transmission fluid spots under car, Burnt transmission fluid smell, Erratic shifting or slipping when fluid is low, Fluid visible on subframe or underbody
Fix: The cooler lines corrode where they connect to the radiator or at crimp points. Replacement involves dropping the subframe or working from below with the car on a lift. 3-4 hours labor plus fluid refill and adaptation with VCDS.
Estimated cost: $800-1,400
Transmission Mounts Collapsing
Occasional · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle in gear, Excessive driveline movement under hard acceleration, Visible sagging or torn rubber on mount inspection
Fix: The rear transmission mount takes a beating on these torquey cars. Replacement requires supporting the transmission and unbolting the crossmember. 2-3 hours. Often done alongside motor mounts if those are also worn.
Estimated cost: $400-700
Timing Chain Tensioner and Guide Wear
Occasional · high severity
Typical onset: 80,000-130,000 mi
Symptoms: Rattling on cold start for first 2-3 seconds, Metallic ticking from front of engine, Check engine light with cam/crank correlation codes (P0016, P0017), Metal shavings in oil filter
Fix: The 4.2L FSI uses multiple chains and tensioners. If they fail, you get valve-to-piston contact. Preventive replacement at 100k is smart. Engine-out not required but front of engine must be disassembled. 12-18 hours labor depending on how far you go (chains only vs full guides and rails).
Estimated cost: $3,000-5,500
Fuel Injector O-Ring Leaks and Injector Failures
Occasional · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Fuel smell in cabin or engine bay, Rough idle and misfires, Fuel trims way out of spec (scan data), Visible fuel seepage at injector seals, Hard starting when hot
Fix: High-pressure direct injectors can leak at the seals or fail internally. Injectors are expensive ($200-400 each), and you need special tools to remove them without damaging the cylinder head. Figure 1 hour per injector for R&R, plus recalibration. Often do all 8 at once to avoid comeback.
Estimated cost: $2,500-4,500
Owner tips
Check oil every 500 miles religiously—these engines drink it and low oil destroys pistons fast
Walnut blast the intake valves every 50,000 miles to prevent carbon-related drivability issues
Use only Audi/VW 502.00 spec oil (0W-40 or 5W-40) and change every 5,000 miles maximum despite the 10k service interval
Get a pre-purchase inspection with compression and leak-down tests—engine rebuilds exceed the car's value
Budget $2,000-3,000 per year for maintenance and repairs if buying over 70k miles
Only buy if you have comprehensive service records proving religious oil changes and carbon cleaning, or budget $10k-15k for an eventual engine rebuild—this is a money pit without maintenance history.
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 may be alternate fitment on some models
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Every control module on the 2008-2016 Audi S5 — 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.
📍 Rear trunk lid, integrated in trunk handle or license plate area
🔧 VCDS or Autel
⚠️ Optional equipment. Calibration for parking guidelines may be needed.
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.
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain model year 2011-2012 Audi S4, S5, Q7, 2012 Audi A6, Volkswagen Touareg Hybrid, and 2012-2013 Audi A7 vehicles. In the affected vehicles the fuel injection system may experience a fuel leak.
Consequence: A fuel leak in the injection system in the presence of an ignition source, increases the risk of a fire.
Remedy: Volkswagen will notify owners, and dealers will replace the fuel rails and corresponding seals, free of charge. The recall began on March 17, 2015. Owners may contact Audi customer service at 1-800-822-2834 or Volkswagen customer service at 1-800-893-5298. Volkswagen's numbers for this recall are 24AP for Audi customers and 24BK for Volkswagen customers.
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 2011 Audi S5 4.2L 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.