Most common 2015 Audi S8 problems
Share of the 6 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Audi S8 complaints by model year
Best S8 years: 2008, 2017, 2020. Compare all years →
2015 Audi S8 recalls (4)
Engine and engine cooling › Engine › Gasoline › Turbo/supercharger
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.
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.
Structure › Body › Hood
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2013-2018 Audi S8 and A8 vehicles. The seal around the engine compartment may come loose and contact hot engine components.
Remedy: Audi will notify owners, and dealers will install a retaining plate to prevent the engine compartment seal from loosening. The recall began September 4, 2020. Owners may contact Audi customer service at 1-800-253-2834.
Fuel system, gasoline › Delivery › Hoses, lines/piping, and fittings
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2013-2016 Audi A8 and S8 vehicles. The fuel supply line for the high pressure fuel pump may become porous and leak fuel.
Remedy: Audi has notified owners, and dealers will install a fuel pressure damper, free of charge. The recall began February 21, 2019. Owners may contact Audi customer service at 1-800-253-2834.
Fuel system, gasoline › Delivery › Hoses, lines/piping, and fittings
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2013-2015 Audi S8 and A8 vehicles. The fuel supply line for the high pressure fuel pump may become porous over time, resulting in a fuel leak.
Remedy: Audi will notify owners, and dealers will replace the fuel line, free of charge. The recall began July 20, 2018. Owners may contact Audi customer service at 1-800-253-2834. Volkswagen's number for this recall is 20AV.
NHTSA defect investigations
Federal safety investigators have looked into 2 possible defects involving the 2015 Audi S8:
Engine Stall - Turbo Failure
On March 29, 2021, the Office of Defects Investigation (ODI) opened Preliminary Evaluation (PE) 21-009 after the agency received 58 reports alleging engine stalling in 2013-2016MY Audi vehicle models A8, S6, S7, S8 & RS7. The subject vehicles are equipped with 4.0L, twin-turbocharged engine. Complainants reported that the vehicles stall suddenly with no warning while driving on the highway or in city traffic.
Engine Stall - Turbo Failure
On March 29, 2021, the Office of Defects Investigation (ODI) opened a Preliminary Evaluation (PE 21-009) after the agency received 58 reports alleging engine stalling in 2013-2016MY Audi vehicle models A8, S6, S7, S8 & RS7 equipped with the 4.0L, twin-turbocharged engine. Complainants reported the vehicles would stall with no warning while driving at highway or city traffic speeds.
What 2015 Audi S8 owners say
Engine & cooling
The contact owns a 2015 Audi S8. The contact stated he was unable to start the vehicle. The contact stated that the Electronic Power Control (EPC) warning light was illuminated. The contact was able to start the vehicle, but the vehicle was shaking while driving. The contact also stated the vehicle had stalled. The contact took the vehicle to an independent mechanic and was informed that the oxygen sensor and oil pressure switch needed to be replaced. The vehicle was repaired but continued to experience the failure. The contact took the vehicle back to an independent mechanic and was referred to a local dealer. The contact called the local dealer and made them aware of the failure. The vehicle was not diagnosed or repaired. The VIN was associated with NHTSA Campaign Number: 22V178000 (Engine and Engine Cooling). The manufacturer had been informed of the failure. …
Was driving on a Saturday afternoon down a busy street when my car started sputtering and had very reduced power. I was able to eventually get to the side of the road and shut the car off. Tried starting the car after a resting period and car would not start. Let it sit longer and finally got it to start but car had very little power when pressing on the gas , but I was able to get to my local Audi dealer for a diagnosis. ($190.00 + tax). I informed the technician of the issues I saw and also that I heard a whining noise coming from the engine. Diagnosis was that both turbos had significant "play" in them and they needed to be replaced. The tech said that this is caused by an oil screen deep inside the engine, which is a known cause of this issue. Price to repair would be $11,500.00!!!! …
2015 Audi S8 engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 4.0L 8-cyl turbo | 8-speed automatic | AWD | 16 / 27 / 20 |
EPA ratings. Class: Midsize car.
Frequently asked questions
Is the 2015 Audi S8 a good car?
Based on 6 owner complaints filed with NHTSA, the 2015 S8 rates average: about as many complaints as a typical year of the S8 at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2015 Audi S8?
The engine & cooling — 5 complaints, 83% of all complaints for this model year. Next is the transmission & drivetrain (1).
How many recalls does the 2015 Audi S8 have?
There are 4 recalls for the 2015 Audi S8, the most recent from March 23, 2022 (turbo/supercharger). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Audi S8?
The best years by complaints, compared at the same age, are 2008, 2017 and 2020. See the full Audi S8 years comparison.
At what mileage do 2015 Audi S8 problems happen?
The median mileage reported in complaints is about 51,000 miles; 25% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.