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Research · Compact Cars

2021 Audi S4Recalls, problems, MPG & safety

NHTSA lists 4 safety recalls and 2 owner complaints for the 2021 Audi S4. Most complaints involve electrical system (1). The EPA rates it 23 mpg combined.

Check a VINAdd to my garage
Combined MPG
23mpg
EPA · 1 version
NHTSA overall
—
Not rated by NCAP
Safety recalls
4campaigns
Latest Oct 2022
Owner complaints
2
Top: electrical system
Fuel cost / yr
$3,450est.
EPA estimate, best version
01 —Recalls

Safety recalls

4 NHTSA campaigns · applies to some vehicles, check your VIN

Back over prevention: display function

Free remedy

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."

Back over preventionReported Oct 5, 2022NHTSA 22V742000

Tires

Free remedy

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.

TiresReported Jan 26, 2022NHTSA 22V034000

Seat belts: rear

Free remedy

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."

Seat beltsReported Aug 5, 2021NHTSA 21V606000
See all 4 recalls with remedies
Data from NHTSA Recalls API · synced Oct 30, 2026 · All recall detailsNHTSA vehicle page
02 —Complaints

Owner complaints by component

2 complaints filed with NHTSA · Jan 2023 – Sep 2025
  1. Electrical system1
  2. Other / unknown1

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

By model year

Complaints for each S4 model year we’ve synced.

View as table
Model yearNHTSA complaints
2000143
200187
200222
200429
200543
200630
20084
201060
201126
201222
201333
201417
20151
20187
20192
202017
20212
Crashes reported
0
Fires reported
0
Injuries reported
0
Deaths reported
0
Data from NHTSA Complaints API · synced Oct 30, 2026NHTSA vehicle page
03 —Common problems

What owners report most

Verbatim excerpts from NHTSA complaints, by component

Electrical system

1 report
“The contact owns a 2021 Audi S4. The contact stated that while driving at an undisclosed speed, the vehicle experienced a loss of automotive power. The check engine warning light was illuminated. The message "Drive System Malfunction - Please Contact Service" was displayed. In addition, the vehicle hesitated to restart and shift into gear as intended. The contact stated that the failure had progressed over time. The vehicle was taken to a local dealer, where it was diagnosed with needing a pending software service update; however, the repairs would not be available until the end of 2025. The manufacturer was made aware of the failure. The failure mileage was approximately 31,000.”
Owner complaint to NHTSAFiled Sep 25, 2025Electrical systemODI 11689741
Send a problem to a mechanic on findmechanic.ai
Data from NHTSA Complaints API (owner reports, unverified) · synced Oct 30, 2026
04 —Key specs

Engines, transmissions & drive

1 version rated by the EPA
EPA class
Compact Cars
Engines
3.0L 6-cyl turbo
Transmissions
Automatic (S8)
Drive
All-Wheel Drive
Fuel
Premium Gasoline

Towing, payload and dimensions aren’t in the EPA or NHTSA data, so we don’t list them.

Data from EPA fueleconomy.gov · synced Oct 30, 2026EPA listing
05 —Fuel economy

EPA fuel economy by version

City / highway / combined, annual fuel cost and CO₂
EPA
VersionCityHwyComb.Fuel / yrCO₂ g/mi
S4
Auto (S8), 6 cyl, 3.0 L, Turbo · All-Wheel Drive
202823$3,450380
  • S4
    Auto (S8), 6 cyl, 3.0 L, Turbo
    20 city · 28 hwy · $3,450/yr
    23
    mpg comb.
Estimate your fuel costCost of ownership
Data from EPA fueleconomy.gov · synced Oct 30, 2026 · Fuel cost is EPA’s annual estimate (15,000 mi, 55% city)
06 —Safety

NHTSA 5-Star Safety Ratings

1 tested variant
NHTSA has not published 5-Star Safety Ratings for the 2021 Audi S4 as of Oct 30, 2026.
Data from NHTSA NCAP Safety Ratings API · synced Oct 30, 2026Vehicle 15587
07 —Maintenance

Maintenance basics

General guidance, not the OEM schedule. Check your owner’s manual.
General guidance
ItemMilesTimeNote
Engine oil & filter5,000–10,000 mi6–12 monthsFollow the oil-life monitor if fitted
Tire rotation5,000–7,500 miEvery oil changeCheck pressure monthly
Engine air filter15,000–30,000 mi1–2 yearsSooner in dusty areas
Cabin air filter15,000–25,000 mi1–2 years
Brake fluid—2–3 yearsAbsorbs moisture over time
Coolant60,000–100,000 mi5–10 yearsLong-life coolants last longer
Spark plugs60,000–100,000 mi—Iridium/platinum plugs at the long end
12V battery—3–5 yearsHeat shortens battery life
  • Engine oil & filter5,000–10,000 mi
    6–12 months
  • Tire rotation5,000–7,500 mi
    Every oil change
  • Engine air filter15,000–30,000 mi
    1–2 years
  • Cabin air filter15,000–25,000 mi
    1–2 years
  • Brake fluid—
    2–3 years
  • Coolant60,000–100,000 mi
    5–10 years
  • Spark plugs60,000–100,000 mi
    —
  • 12V battery—
    3–5 years
Typical intervals for modern cars. Severe service (towing, short trips, extreme heat or cold) shortens them.
09 —FAQ

2021 S4 questions

How many recalls does the 2021 Audi S4 have?

4 safety recalls as of Oct 30, 2026, according to NHTSA. Recall repairs are free at a dealer. Check your VIN to see whether your car is included and whether the repair was done.

What are the most common 2021 Audi S4 problems?

Owners filed 2 complaints with NHTSA. The most-cited components are electrical system (1). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.

What MPG does the 2021 Audi S4 get?

The EPA rates the 2021 Audi S4 at 23 mpg combined, depending on engine and drivetrain (1 version rated).

Data from NHTSA & EPA · synced Oct 30, 2026