2021 Audi A4
The Verdict
Worst problem area
Driver Assistance & Speed Control
Driver Assistance & Speed Control leads by volume: 4 of 11 complaints (36%) mention it.
Complaints filed fell from 127 in 2020 to 11 in 2021.
Data last changed . Sources: NHTSA complaints and recalls, EPA fuel economy data. Methodology
Cost, Fuel Economy & Complaint History
| Category | 2019 | 2020 | 2021 | 2022 | 2023 | vs. 2021 Compact Cars |
|---|---|---|---|---|---|---|
| Annual fuel cost ($) | 2,600–3,100 | 2,600–3,000 | 2,750–3,000 | 2,650–3,000 | 2,750–3,000 | |
| Combined MPG | 25–30 | 26–30 | 26–28 | 26–29 | 26–28 | |
| City / Highway MPG | 22–27 / 29–34 | 23–27 / 31–35 | 24–25 / 30–34 | 24–26 / 30–34 | 23–24 / 30–33 | |
| CO₂ tailpipe (g/mi) | 292–356 | 295–337 | 311–335 | 307–335 | 322–344 | |
| Complaints filed | 10 | 127 | 11 | 6 | 10 | |
| Recalls issued | 1 | 3 | 4 | 3 | 0 | |
| Crash-involved complaints | 2 | 1 | 3 | 0 | 1 | |
| Fire-involved complaints | 0 | 0 | 0 | 0 | 0 | |
| Injuries reported | 2 | 0 | 1 | 0 | 1 | |
| Deaths reported | 0 | 0 | 0 | 0 | 0 | |
| Configurations compared | 2 | 2 | 2 | 2 | 2 |
Not compared: this database has no vehicle sales or registration figures, so a raw count mostly reflects how many were sold, not how safe the vehicle is.
Common questions
How many recalls does the 2021 Audi A4 have?
4 NHTSA recall campaigns as of Sep 16, 2026. Check your VIN with NHTSA to see whether one applies to your car.
What is the most common complaint about the 2021 Audi A4?
Driver Assistance & Speed Control: 4 of 11 NHTSA complaints (36%) mention it.
What gas mileage does the 2021 Audi A4 get?
EPA rates it 26–28 MPG combined.
How much does it cost to fuel a 2021 Audi A4?
EPA estimates $2,750–$3,000 a year in fuel costs, using EPA's assumptions.
Similar Vehicles
EPA-Rated Configurations (3)
| Configuration | Transmission | Cylinders | Displacement | Drivetrain | Fuel Type | Vehicle Class | City | Highway | Combined | Annual Fuel Cost | CO₂ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Configuration 1 | Automatic (AM-S7) | 4 | 2.0L | All-Wheel Drive | Premium | Compact Cars | 24 mpg (low) | 31 mpg | 27 mpg | $2,850 | 331 g/mi |
| Configuration 2 | Automatic (AM-S7) | 4 | 2.0L | All-Wheel Drive | Premium | Small Station Wagons | 24 mpg (low) | 30 mpg (low) | 26 mpg (low) | $3,000 (high) | 335 g/mi (high) |
| Configuration 3 | Automatic (AM-S7) | 4 | 2.0L | All-Wheel Drive | Premium | Compact Cars | 25 mpg (high) | 34 mpg (high) | 28 mpg (high) | $2,750 (low) | 311 g/mi (low) |
Complaints by Category
| Category | Complaints | Crash-Involved | Fire-Involved | Injuries | Deaths |
|---|---|---|---|---|---|
| Engine | 1 | 0 | 0 | 0 | 0 |
| Transmission & Drivetrain | 2 | 0 | 0 | 0 | 0 |
| Fuel System | 0 | 0 | 0 | 0 | 0 |
| Electrical | 3 | 0 | 0 | 0 | 0 |
| Brakes | 0 | 0 | 0 | 0 | 0 |
| Steering | 0 | 0 | 0 | 0 | 0 |
| Suspension, Wheels & Tires | 3 | 1 | 0 | 1 | 0 |
| Airbags & Restraints | 1 | 1 | 0 | 0 | 0 |
| Driver Assistance & Speed Control | 4 | 2 | 0 | 1 | 0 |
| Body, Seats & Latches | 0 | 0 | 0 | 0 | 0 |
| Visibility & Lighting | 0 | 0 | 0 | 0 | 0 |
| Other | 3 | 1 | 0 | 0 | 0 |
A complaint that names more than one category is counted in each, so the rows can add up to more than the total number of complaints.
Recalls (4)
BACK OVER PREVENTION:DISPLAY FUNCTION · Campaign 22V742000 · Oct 6, 2022
Defect: 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 Coupe, A5 Cabrioleet, A4 Sedan, A4 Allroad, E-Tron Sportback Quattro, SQ7, S5 Cabriolet, E-Tron Quattro, SQ8, SQ5 Sportback, SQ5, S8, S7, S6 Sedan, S5 Sportback, S5 Coupe, 2022 E-Tron GT, and 2021-2022 RSQ8 vehicles. Due to a software issue, a blank or black screen may be displayed instead of the rearview camera image when the vehicle is placed in reverse gear. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."
Consequence: A blank rearview camera display can reduce the driver's rear visibility, increasing the risk of a crash.
Remedy: Dealers will update the infotainment unit software, free of charge. Owner notification letters were mailed October 25, 2022. Owners may contact Audi's customer service at 1-800-253-2834. Volkswagen's number for this recall is 91DZ.
SUSPENSION:REAR:AXLE:NON-POWERED AXLE ASSEMBLY; TIRES · Campaign 22V034000 · Jan 27, 2022
Defect: 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, A6 Sedan, A7, A8, Q5, S4 Sedan, S5 Coupe, S5 Cabriolet, S6 Sedan, S7, S8, SQ5, 2021 Q5 Sportback, Q7, Q8, RS6 Avant, RS7, RSQ8, SQ5 Sportback, SQ7, and SQ8 vehicles. The rear axle alignment may not have been inspected after the repairs for Recall 21V-295 (42L1) were performed.
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 or unevenly worn tires, free of charge. Owner notification letters were mailed March 3, 2022. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 42L5.
SEAT BELTS; SEAT BELTS:REAR/OTHER:RETRACTOR · Campaign 21V606000 · Aug 5, 2021
Defect: 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, E-Tron Sportback Quattro, Q3, Q5, Q5 Sportback, Q7, Q8, RS5 Sportback, RS5 Coupe, RS6 Avant, RS7, RSQ8, S4 Sedan, S5 Cabriolet, S5 Coupe, S5 Sportback, S6 Sedan, S7, S8, SQ5, SQ5 Sportback, SQ7, SQ8, and 2021-2022 S3 Sedan vehicles. The rear seat belt automatic locking retractors may deactivate early, which can prevent the child restraint system from securing properly. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
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. Owner notification letters were mailed August 27, 2021. Owners may contact Volkswagen customer service at 1-800-893-5298 and Audi customer service at 1-800-253-2834. Volkswagen's numbers for this recall are 69CR (VW) and 69CS (Audi).
SUSPENSION:REAR:AXLE:NON-POWERED AXLE ASSEMBLY · Campaign 21V295000 · Apr 27, 2021
Defect: 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 sedan, A4 Allroad, SQ5, S7, A6 sedan, S5 coupe, S4 sedan, S5 Cabriolet, A5 coupe, 2019-2021 RS5 coupe, A5 Sportback, S5 Sportback, RS5 Sportback vehicles. The lock nut on the trailing arm of the rear axle may break due to stress corrosion.
Consequence: A broken lock nut may misalign the rear axle, causing a loss of control and increasing the risk of a crash.
Remedy: Dealers will replace the lock nuts and, if necessary, the associated bolts, free of charge. Owner notification letters were mailed June 4, 2021. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 42L1.