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2021 Audi A4 Service and Repair Manual
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$29.99 USD
Unit price
Covers all 2021 A4 trims — Select Sedan 4-Door, S Line Sedan 4-Door, Dynamic Sedan 4-Door ·
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Complete repair procedures
Wiring diagrams & schematics
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2021 Audi A4 Service and Repair Manual
Regular price
$29.99 USD
Unit price
2021 Audi A4 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
- Select Sedan 4-Door
- S Line Sedan 4-Door
- Dynamic Sedan 4-Door
Engines covered
- 2.0L 1984CC 121Cu. In. l4 GAS 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
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
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
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
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
This bulletin provides informaiotn when the starter battery is discharged or defective.
This bulletin provides information when the convenience openeing does not work.
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
This bulletin provides information when there are noises after selecting a ear while idling and the vehicle is stationary, or while driving.
This bulletin provides information when there is noise from the backrest of the front seat.
This bulletin provides informaiton when the windscreen/rear window washer pump is not working (B126101, B126113).
This bulletin provides informaiton when traffic jam assist is unavailable/active lane assist fault is reported in the instrument cluster.
This bulletin provides informatin when there is binding or vibrations in tight turns with quattro Ultra.
Showing the 8 most recent of 987 technical service bulletins on file with NHTSA.
The contact leased a 2021 Audi A4. The contact stated that the dealer had provided her with the vehicle rental while her vehicle was being repaired. The contact stated that while driving at 4 MPH and
The contact leased a 2021 Audi A4. The contact stated that the dealer had provided her with the vehicle rental while her vehicle was being repaired. The contact stated that while driving at 4 MPH and
The reversing image occasionally appears white screen phenomenon During the process of reversing, the reversing screen suddenly turns white and cannot see anything behind, which brings danger to the
The contact owned a 2021 Audi A4. The contact stated that while driving at a low rate of speed through a parking lot, the vehicle independently accelerated and the brake pedal locked. The vehicle acce
The contact owned a 2021 Audi A4. The contact stated that while driving at a low rate of speed through a parking lot, the vehicle independently accelerated and the brake pedal locked. The vehicle acce
Showing the 5 most serious of 19 complaints filed with NHTSA.
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