2021 Audi S8 Service and Repair Manual

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Fits the 2021 S8 — Base Sedan 4-Door ·
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2021 Audi S8 service and repair manual a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.

What's included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Wiring diagrams and electrical sections
  • Powertrain, brakes, steering, suspension, HVAC and more

Trims covered

  • Base Sedan 4-Door

Engines covered

  • 4.0L 3996CC 244Cu. In. V8 MILD HYBRID EV-GAS (MHEV) DOHC Turbocharged

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams
NHTSA #21V29500026/04/2021Component: SUSPENSION:REAR:AXLE:NON-POWERED AXLE ASSEMBLY

Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Q7, Q8, Q5 Sportback, SQ5 Sportback, RS6 Avant, RS7, RS Q8, 2020-2021 Audi S6 sedan, Q5, A8, S8, A7, A6 Allroad, A5 Cabriolet, A4 sed

Consequence

A broken lock nut may misalign the rear axle, causing a loss of control and increasing the risk of a

Remedy

Dealers will replace the lock nuts and, if necessary, the associated bolts, free of charge. Owner n

NHTSA #22V03400026/01/2022Component: TIRES

Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2021 Audi A5 Sportback, RS5 Coupe, RS5 Sportback, S5 Sportback, 2020-2021 A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A6 Allroad, A

Consequence

Rear axle misalignment may cause premature or uneven tire wear, increasing the risk of a crash.

Remedy

Dealers will inspect the rear axle, adjust the alignment as necessary, and replace any prematurely o

NHTSA #21V11100024/02/2021Component: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)

Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2021 Audi A8 and 2020-2021 Audi S8 vehicles. A missing sealing pin may allow moisture to enter the engine control module connector,

Consequence

An engine control module malfunction may cause the engine to stall, increasing the risk of a crash.

Remedy

Audi will notify owners, and dealers will inspect the engine control module connector for a missing

NHTSA #21V82500020/10/2021Component: BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Audi A8 and S8, 2022 Audi A5 Sportback, A4 Sedan, E-Tron GT, Q3, Q5, RS6 Avant, A3 Sedan, S5 Sportback, Q5 Sportback, Q7, Q8, RSQ8, S

Consequence

A rear-view camera that does not display an image reduces the driver's rear view, increasing the ris

Remedy

Dealers will update the infotainment unit parameters, free of charge. Owner notification letters we

NHTSA #25V90000019/12/2025Component: BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2026 vehicles. Please see the recall report for a complete list of models. A software error may prevent the rearview camera image fro

Consequence

A rearview image that does not display reduces the driver's view behind the vehicle, increasing the

Remedy

Dealers will update the software, free of charge. Owner notification letters were mailed January 14,

NHTSA #22V74200005/10/2022Component: BACK OVER PREVENTION:DISPLAY FUNCTION

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Audi A8, RS7, RS6 Avant, RS5 Sportback, RS5 Coupe, Q8, Q7, Q5 Sportback, S4 Sedan, Q5, A7, A6, A6 Allroad, A5 Sportback, A5 Cou

Consequence

A blank rearview camera display can reduce the driver's rear visibility, increasing the risk of a cr

Remedy

Dealers will update the infotainment unit software, free of charge. Owner notification letters were

NHTSA #21V60600005/08/2021Component: SEAT BELTS:REAR/OTHER:RETRACTOR

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Volkswagen ID4, Audi A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A5 Sportback, A6 Allroad, A6 Sedan, A7, A8, E-Tron Quattro,

Consequence

An unsecured child restraint system can increase the risk of injury during a crash.

Remedy

Dealers will inspect, and replace as necessary, the middle-rear seat belt assemblies, free of charge

TSB #11033492

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

TSB #11033483

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

TSB #11033477

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

TSB #11033475

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. Adde

TSB #11033469

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

TSB #11033457

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

TSB #11032194

This bulletin is informational and contains information on the various warning lamps that may appear.

TSB #11032191

This bulletin provides informationw hen there is water in the door sill; sloshing noises.

Showing the 8 most recent of 1083 technical service bulletins on file with NHTSA.

20221231Component: ELECTRICAL SYSTEM

When started up on 11/17/22, multiple warning lights came on in rapid sequence advising of an electrical system & battery malfunction. Warning was to not drive the vehicle and contact service. I shut

20221231Component: ENGINE

When started up on 11/17/22, multiple warning lights came on in rapid sequence advising of an electrical system & battery malfunction. Warning was to not drive the vehicle and contact service. I shut

20221231Component: POWER TRAIN

When started up on 11/17/22, multiple warning lights came on in rapid sequence advising of an electrical system & battery malfunction. Warning was to not drive the vehicle and contact service. I shut

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