Owners have filed 12 complaints with NHTSA about this car, most about the electrical, suspension, and transmission. The 7 checks below target those problems, in the order you would do them at the car.
2021Tick items off on your phone at the car, or print it. Ticks stay on this device.
0/7 checked
2021 Audi A4: inspection sheet
Before you go, or before you touch the car0/3
Ask the seller not to warm the car up first0/1
At least 20 minutes, with some highway0/3
These checks are specific to this model year. For tires, body panels, fluids, and the other basics every used car needs, use the general inspection guide.
These years share the 2021's design and most of its parts, so their problems are the ones to look for on this car too.
Worth adding to your 2021 checks
Worth adding to your 2021 checks
Worth adding to your 2021 checks
EPA figures for each version of the 2021 Audi A4. Use them to confirm you are looking at the version that was advertised, and as a yardstick on the test drive.
| Version | Drive | EPA rating |
|---|---|---|
| 2.0L 4-cyl | AWD | 28 mpg |
NHTSA complaints for the 2021 Audi A4, grouped by the part owners named. Open a row to read what goes wrong.
The digital instrument cluster goes blank or keeps rebooting, sometimes while the car is moving. When it fails, the speedometer, tachometer, fuel gauge and warning messages disappear. Drivers then rely on the Audi phone app for mileage, service and safety alerts. One report describes a blank screen with a red triangle that tries to start up and crashes again. All 3 complaints describe this same failure. Owners say dealers quote a full-price repair, and two argue the fix should be covered by a recall. The reports show no mileage pattern.
Neither report describes a worn or broken suspension part. One is a parts shortage. The owner got a suspension recall notice, but the dealer did not have the parts to do the repair. The other report is crash-related, with one injury. It describes the car accelerating on its own at parking-lot speed, brakes that do not respond, a collision with airbag deployment, and no warning lights. That report reads as unintended acceleration rather than a suspension fault. Two reports are too few to show a pattern.
Shudder, vibration and humming appear in both reports, but under different conditions. One describes shuddering in slow, tight turns. A dealer diagnosed it as a failing AWD clutch at 38,888 miles. The other describes trembling, a shaking floor, high revs, screeching noises, jerky acceleration in the first gears and a rough idle. These symptoms start after about an hour of highway driving, first reported around 13,xxx miles, and come with no check-engine light or stored codes. Neither report involves a crash.
Excerpts from complaints A4 owners filed with NHTSA, as written. Listen for the same symptoms on your test drive.
The main instrument cluster is not stable- it tries to start up then crashes. As a result, speedometer, rpm’s, gas tank gauge, etc are not available while driving. The screen displays blank with a red triangle, tries to start up then crashes again. This seems similar to Audi recall campaign 90VC, but for some reason the A4 was not included in the recall, but I’m having similar symptoms with my A4.
Filed with NHTSA, June 2025
The instrument cluster has stop working. Have to monitore vehicle information, Mileage, service, Safty notifications and general vehicle information from the Audi app.
Filed with NHTSA, October 2025
Complaints for this year next to the average for the other model years, area by area.
The 2021 ranks third for owner complaints among 5 A4 years, well under the average of the others. Newer years have had less time to collect complaints, so compare like with like.
Redesigns and mid-cycle updates change what can go wrong.
The 2021 is the sixth model year of the A4's fifth generation (2016–2023).
It includes the 2020 update.
What changed for 2020
Recall repairs are free at any Audi dealer, but the seller may never have had them done. Check each campaign number against the VIN.
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.".
Risk: A blank rearview camera display can reduce the driver's rear visibility, increasing the risk of a crash.
Fix: 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.
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.
Risk: Rear axle misalignment may cause premature or uneven tire wear, increasing the risk of a crash.
Fix: 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.
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.".
Risk: An unsecured child restraint system can increase the risk of injury during a crash.
Fix: 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).
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.
Risk: A broken lock nut may misalign the rear axle, causing a loss of control and increasing the risk of a crash.
Fix: 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.
Cars shoppers compare with the Audi A4, with their own 2021 checklists.
2021 owner complaints, side by side
