The Audi A4 Avant 40 TFSI Mild Hybrid S tronic, produced from July 2020 to 2024, represents a significant iteration of the B9 (8W) generation A4 Avant. Positioned as a mid-range offering within the A4 lineup, this variant combined a 2.0-liter turbocharged four-cylinder engine with a 48-volt mild hybrid system and Audi’s seven-speed S tronic dual-clutch transmission. It aimed to balance performance, fuel efficiency, and practicality for the European market, where the A4 Avant is a popular choice for families and business users. This model benefitted from the facelift introduced in 2019, featuring updated styling and enhanced technology.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 Avant (B9 8W, facelift 2019) |
| Type (Engine) | 40 TFSI (204 Hp) Mild Hybrid S tronic |
| Start of production | July, 2020 |
| End of production | 2024 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 6.3-7.3 l/100 km (37.3 – 32.2 US mpg) |
| CO2 emissions (WLTP) | 143-165 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.3 sec |
| Acceleration 0 – 62 mph | 7.3 sec |
| Acceleration 0 – 60 mph | 6.9 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Power | 204 Hp @ 4475-6000 rpm |
| Torque | 320 Nm @ 1450-4475 rpm (236.02 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | DMSA |
| Engine displacement | 1984 cm3 (121.07 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 82.5 mm (3.25 in.) |
| Piston Stroke | 92.8 mm (3.65 in.) |
| Compression ratio | 12.2:1 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 5.2 l (5.49 US qt | 4.58 UK qt) |
| Coolant | 8 l (8.45 US qt | 7.04 UK qt) |
| Kerb Weight | 1535 kg (3384.1 lbs.) |
| Max. weight | 2140 kg (4717.89 lbs.) |
| Trunk (boot) space – minimum | 495 l (17.48 cu. ft.) |
| Trunk (boot) space – maximum | 1495 l (52.8 cu. ft.) |
| Fuel tank capacity | 54 l (14.27 US gal | 11.88 UK gal) |
| Drivetrain Architecture | Front wheel drive, MHEV |
| Number of gears and type of gearbox | 7 gears, automatic transmission S tronic |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Length | 4762 mm (187.48 in.) |
| Width | 1847 mm (72.72 in.) |
| Height | 1460 mm (57.48 in.) |
| Wheelbase | 2820 mm (111.02 in.) |
Powertrain & Engine Architecture
At the heart of the A4 Avant 40 TFSI lies the DMSA engine, a 1.984-liter inline-four cylinder gasoline engine. This engine utilizes direct fuel injection and a single turbocharger with an intercooler to deliver a balance of power and efficiency. The engine’s output of 204 horsepower at 4475-6000 rpm and 320 Nm (236 lb-ft) of torque between 1450-4475 rpm is achieved through precise engine management and optimized combustion. The ‘40 TFSI’ designation doesn’t directly correlate to engine displacement, but rather represents a position within Audi’s power output naming scheme.
The mild hybrid system, a key feature of this variant, employs a 48-volt electrical system and a belt-driven starter-generator. This system allows for extended engine-off coasting, regenerative braking to recapture energy, and smoother start-stop operation, contributing to improved fuel economy. The seven-speed S tronic dual-clutch transmission provides rapid and seamless gear changes, enhancing both performance and driving comfort. The S tronic’s programming is tuned to prioritize efficiency in everyday driving situations, while still offering responsive shifts when needed.
Driving Characteristics
The A4 Avant 40 TFSI S tronic delivers a refined and capable driving experience. Acceleration from 0 to 60 mph takes approximately 6.9 seconds, making it adequately quick for most driving scenarios. The S tronic transmission contributes to a smooth power delivery, and the mild hybrid system helps to minimize turbo lag. Compared to the more powerful 45 TFSI variant, the 40 TFSI offers slightly less outright performance, but it compensates with improved fuel economy. Against diesel-powered A4 Avants, such as the 35 TDI, the 40 TFSI provides a more responsive and refined engine character, although it typically achieves lower fuel economy figures.
The gear ratios in the S tronic transmission are optimized for both acceleration and cruising efficiency. Lower gears provide brisk acceleration, while higher gears allow for relaxed highway driving. The steering is precise and well-weighted, providing good feedback to the driver. The suspension setup offers a comfortable ride quality without sacrificing handling stability.
Equipment & Trim Levels
The A4 Avant 40 TFSI typically came equipped with a generous array of standard features. These included Audi’s MMI infotainment system with a 7-inch touchscreen display, Audi Virtual Cockpit (digital instrument cluster), three-zone automatic climate control, and a suite of driver-assistance systems such as lane departure warning and automatic emergency braking. Interior upholstery was typically cloth or a combination of cloth and leatherette, with optional upgrades to full leather available.
Optional extras included a larger touchscreen display, a premium sound system, adaptive cruise control, a panoramic sunroof, and various styling packages. Trim levels varied slightly depending on the market, but generally offered increasing levels of luxury and technology.
Chassis & Braking
The A4 Avant 40 TFSI utilizes a sophisticated chassis design featuring independent multi-link suspension at both the front and rear axles. This suspension setup provides a comfortable ride quality and excellent handling characteristics. The front suspension incorporates anti-roll bars to reduce body roll during cornering. Braking duties are handled by ventilated discs at the front and solid discs at the rear, providing ample stopping power. The car is equipped with ABS (Anti-lock Braking System), electronic brake-force distribution, and brake assist for enhanced safety.
Market Reception & Comparison
The Audi A4 Avant 40 TFSI Mild Hybrid S tronic was generally well-received by automotive critics. It was praised for its refined engine, smooth transmission, comfortable ride, and fuel efficiency. Comparisons with rivals such as the BMW 3 Series Touring and Mercedes-Benz C-Class Estate often highlighted the A4 Avant’s well-roundedness and user-friendly technology. While some critics noted that the 40 TFSI lacked the outright performance of its more powerful siblings, it was considered a sensible and practical choice for buyers prioritizing efficiency and comfort.
Legacy
The 1.984-liter turbocharged engine and S tronic transmission combination used in the A4 Avant 40 TFSI have proven to be relatively reliable. The mild hybrid system has also demonstrated good durability. On the used car market, these models are generally sought after for their balance of performance, efficiency, and features. Regular maintenance, including oil changes and adherence to Audi’s recommended service intervals, is crucial for ensuring long-term reliability. The A4 Avant 40 TFSI represents a well-engineered and practical estate car that continues to offer a compelling ownership experience.
