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2021 Audi

S8

Auto (S8), 8 cyl, 4.0 L, Turbo

Audi S8: best and worst years
2021 Audi S8 (photo 1 of 3)

Photo may show a different model year; you're viewing the 2021.

PhotoAlexander MiglCC BY-SA 4.0Wikimedia Commons

Overview

Body
Large CarsEPA, from EPA, last updated 6/11/2026
Drivetrain
All-Wheel DriveEPA, from EPA, last updated 6/11/2026
Transmission
Automatic (S8)EPA, from EPA, last updated 6/11/2026
Powertrain
HybridEPA, from EPA, last updated 6/11/2026
Fuel
PremiumEPA, from EPA, last updated 6/11/2026

Engine & performance

Cyl
8EPA, from EPA, last updated 6/11/2026
Aspiration
TurbochargedEPA, from EPA, last updated 6/11/2026
Start-stop system
YesEPA, from EPA, last updated 6/11/2026

Efficiency

MPG Hwy
22 mpgEPA, from EPA, last updated 6/11/2026
MPG City
13 mpgEPA, from EPA, last updated 6/11/2026
MPG Comb
16 mpgEPA, from EPA, last updated 6/11/2026
Fuel $/yr
$4,800EPA, from EPA, last updated 6/11/2026
CO₂
545 g/miEPA, from EPA, last updated 6/11/2026
Eco Score
2/10EPA, from EPA, last updated 6/11/2026
Smog score
3/10
Elec. Range
0 miEPA, from EPA, last updated 6/11/2026
SmartWay certified
No

Dimensions & capacity

Length
204 inNHTSA vPIC, from NHTSA vPIC, last updated 6/4/2026
Width
77 inNHTSA vPIC, from NHTSA vPIC, last updated 6/4/2026
Height
58 inNHTSA vPIC, from NHTSA vPIC, last updated 6/4/2026
Wheelbase
118 inNHTSA vPIC, from NHTSA vPIC, last updated 6/4/2026
Curb Weight
5,313 lbNHTSA vPIC, from NHTSA vPIC, last updated 6/4/2026
Pass. Vol
111 ft³EPA, from EPA, last updated 6/11/2026
Cargo Vol
13 ft³EPA, from EPA, last updated 6/11/2026

Safety NHTSA, model year

Stability control (ESC)
Standard
Forward-collision warning
Standard
Lane-departure warning
Standard
Recalls
8
Owner complaints
1

Reported problems NHTSA owner complaints, model year

  • ELECTRICAL SYSTEM33%
  • ENGINE33%
  • POWER TRAIN33%

Source: NHTSA owner complaints, 3 total.

Audi S8: best and worst years

Known issues manufacturer service bulletins, model year

1,025 service bulletins filed with NHTSA for this model year

  • May 26, 2026UNKNOWN OR OTHERAOS-26-25

    This is a notice for software changes with the ODIS diagnostic program to correct the communication during vehicle programming function: A software fix is needed to correct the issue: The ODIS Audi Brand update 2.41.1 is setting a ODS5003E error code when you perform the 90TV SVM flash.

  • May 22, 2026ELECTRICAL SYSTEMTSB_2080517_4

    This bulletin provides informaiotn when the starter battery is discharged or defective.

  • May 15, 2026VISIBILITY/WIPERTSB_2067557_2

    This bulletin provides informaiton when the windscreen/rear window washer pump is not working (B126101, B126113).

  • May 13, 2026ELECTRICAL SYSTEMTSB_2076264_6

    This bulletin provides repair instructions for the overhead view camera; gen 3.

  • May 8, 2026ELECTRICAL SYSTEMTSB_2077443_3

    This bulletin provides information when the convenience openeing does not work.

  • May 6, 2026POWER TRAINTSB_2074808_4

    The high-voltage batteries in electric vehicles are subject to various ageing effects which could lead to the energy content (energy density) being reduced. This reduction in the energy content, which is due to factors. Revised header. Added Model years

  • Apr 30, 2026ELECTRICAL SYSTEMTSB_2080517_3

    This bulletin provides informaiotn when the starter battery is discharged or defective.

  • Apr 30, 2026ENGINETSB_2074303_12

    This bulletin provides informaiton when there is a red coolant temparature/coolant level warning lamp; 4.0 ltr. V8 TFSI.

  • and 1,017 more

Source: NHTSA manufacturer communications (technical service bulletins).

Warranty manufacturer terms, by make

Basic
4 yr / 50k mi
Powertrain
4 yr / 50k mi
Roadside assistance
4 yr
Maintenance
3 yr / 30k mi
EV battery
8 yr / 100k mi

Information is gathered on a best-effort basis from public sources, may be incomplete or out of date, and is not purchasing or financial advice. Verify with the manufacturer or dealer before buying.