“Fun vehicle to drive. Great combo performance and comfort. Just what I wanted. Understated looks, luxury comfort and great performance. Must have the massage seats.”
2021 Audi S4: What's New, Specs & Features
Last updated August 4, 2026
The 2021 Audi S4 is a feature-upgrade year, not a redesign. The main change is more standard cabin technology and driver-assistance equipment across the lineup.
About the 2021 Audi S4
5th-generation S4 (B9), second model year after the 2020 refresh.
The S4 is Audi’s compact sport sedan for drivers who want strong straight-line punch, all-weather traction, and a polished cabin without stepping up to the more expensive RS lineup. Its core appeal is the blend of a 349-hp turbo V6, standard quattro all-wheel drive, and everyday sedan usefulness. Compared with rivals, the S4 leans toward fast, secure, and easy to live with rather than raw or flashy.
The Premium trim emphasizes performance with a 349-horsepower turbocharged V6, all-wheel drive, sport suspension, upgraded brakes, and a 10.1-inch touchscreen. Premium Plus adds daily-use features such as adaptive cruise control, a digital instrument display, and a surround-view camera, while Prestige brings navigation, a head-up display, heated rear seats, and upgraded audio and lighting.
What changed, by category
Safety
Lane departure warning became standard across the lineup. Premium Plus also gained standard adaptive cruise control, active lane assistance, a surround-view camera, and a steering wheel that detects whether the driver’s hands are on it.
Tech
Wireless Apple CarPlay and a toll-payment module built into the rearview mirror became standard. Premium Plus gained a standard heated steering wheel, as did Prestige, while Prestige added standard heated rear seats. On Premium, remote start moved from standard to optional.
2021 Audi S4 specs and features by trim
| Feature | |||
|---|---|---|---|
| Engine | 6-Cyl, Turbo, 3.0 Liter | 6-Cyl, Turbo, 3.0 Liter | 6-Cyl, Turbo, 3.0 Liter |
| Transmission | Automatic, 8-Spd & Tiptronic | Automatic, 8-Spd & Tiptronic | Automatic, 8-Spd & Tiptronic |
| Drivetrain | quattro AWD | quattro AWD | quattro AWD |
| Fuel Type | Gas | Gas | Gas |
| MPG City | 20 mpg | 20 mpg | 20 mpg |
| MPG Highway | 28 mpg | 28 mpg | 28 mpg |
| Horsepower | 349 hp | 349 hp | 349 hp |
| Torque | 369 lb-ft | 369 lb-ft | 369 lb-ft |
| Trunk/Cargo | 12 cu-ft | 12 cu-ft | 12 cu-ft |
| Rear Legroom | 35.7 in | 35.7 in | 35.7 in |
| Seats | 5 | 5 | 5 |
| Doors | 4 | 4 | 4 |
| Adaptive Cruise Control | |||
| Blindspot Sensors | |||
| Cruise Control | |||
| Front & Rear Parking Sensors | |||
| Lane Departure Warning | |||
| Active Lane Keep Assistance | |||
| Park Assist | |||
| Rear View Camera | |||
| Top View Camera | |||
| Alloy Wheels | |||
| Auto-Dimming Exterior Mirrors | |||
| LED Headlights | |||
| Power Moonroof | |||
| Power Folding Exterior Mirrors | |||
| Rear Spoiler | |||
| Remote Control Liftgate/Trunk Release | |||
| Roof Rails | |||
| Navigation System | |||
| Premium Audio | |||
| Satellite Radio | |||
| Smartphone Interface | |||
| Touch Screen Monitor | |||
| Heated Front Seats | |||
| Heated Rear Seats | |||
| Heated Steering Wheel | |||
| Leather Seats | |||
| Memory Driver's Seat | |||
| Proximity Keyless Entry | |||
| Rear Window Shades | |||
| Remote Start | |||
| Ventilated Front Seats | |||
Frequently asked questions
What is the biggest change to the 2021 Audi S4?
The biggest change is more standard technology and driver-assistance equipment. Every 2021 S4 gained wireless Apple CarPlay, lane departure warning, and a toll-payment module built into the rearview mirror.
Was the 2021 Audi S4 redesigned?
No, the 2021 Audi S4 was not redesigned. It is the second model year after the 2020 refresh, with updates focused on standard equipment rather than the body, structure, or engine.
Did the 2021 Audi S4 get a new engine?
No, the 2021 S4 kept its 349-horsepower turbocharged 3.0-liter V6 and all-wheel-drive system. There was no significant powertrain change for this model year.
What changed on the 2021 Audi S4 Premium Plus?
The 2021 S4 Premium Plus gained standard adaptive cruise control, active lane assistance, a surround-view camera, a hands-on-detection steering wheel, and a heated steering wheel. It also received the lineup-wide additions of wireless Apple CarPlay, lane departure warning, and the integrated toll module.
What changed on the 2021 Audi S4 Prestige?
The 2021 S4 Prestige added standard heated rear seats and a standard heated steering wheel. It also gained the lineup-wide wireless Apple CarPlay, lane departure warning, and integrated toll module.
2021 Audi S4 Reviews
What owners are saying about the 2021 Audi S4.
4.3
2021 Audi S4
(29 reviews)
“Love the car; great color combination; great styling, great quality, solid build; fast; not great gas mileage”
“Great vehicle. Pleasure to drive and comfortable interior. One constant issue is that the instrument cluster screen tends to overheat in hot weather and turn off which can be particularly inconvenient”