This bulletin provides information on VIN Plates, Safety Certification labels, and the ordering procedures.
full bulletin at NHTSA ↗2015 Audi S8 engine problems
moderate 5 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Complaints
5
Recalls
0
Avg fix
$3,100
When does it fail?
Of the 5 engine complaints filed for the 2015 Audi S8, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
No new NHTSA engine complaint has been filed on this vehicle in over 7 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This bulletin provides information on the use of the Audi frequencly analysis app, and where the application can be downloaded.
full bulletin at NHTSA ↗This bulletin provides information regarding UV leak additive for finding oil leaks.
full bulletin at NHTSA ↗This bulletin provides information when there is increased oil consumption; >0.5ltr/1000 km.
full bulletin at NHTSA ↗This bulletin provides informatin when the engine does not run smoothly at idling speeds.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
What owners are reporting 5 most recent
Only 43,750 miles and the engine is being completely rebuilt. New cam adjusters, new timing chain tensioners, new timing chain guides... This shouldn't happen on a car with such few miles.
I was driving at highway speed when the engine suddenly started to shudder and lose power. The check engine light immediately started to flash and the engine stalled. I was stopped in a busy highway during rush hour. I eventually got the car to a safe location and pulled the turbo air intake to inspect the turbo with a borescope. The bank 1 turbo had damaged itself. This should not happen on…
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…
Turbo failure and positive crankcase ventilation (PCV) failure. Whining noise from PCV and smoke out the tail pipes with no power. Had to pay out of pocket to remedy issues.
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…
Had engine trouble with your 2015 Audi S8?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2015 Audi S8?
It's a documented issue but not catastrophic. 5 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Based on the 5 complaints filed, engine issues most often appear around 65,138 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2015/Audi/S8.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.