The Audi A4 40 TFSI quattro ultra Mild Hybrid S tronic, produced from July 2020 to 2024, represents a significant iteration of the B9 (8W) generation A4, following the 2019 facelift. This variant occupied a key position in Audi’s lineup, offering a balance between performance, efficiency, and technology. It was marketed as a premium compact executive sedan, competing with vehicles like the BMW 3 Series, Mercedes-Benz C-Class, and Acura TLX. The “40 TFSI” designation indicates the engine’s power output within Audi’s naming scheme, while “quattro ultra” denotes the advanced all-wheel-drive system, and “Mild Hybrid” highlights the inclusion of a 12V mild hybrid system for improved fuel economy. The S tronic transmission is Audi’s dual-clutch transmission, known for its quick and smooth shifts.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 (B9 8W, facelift 2019) |
| Type (Engine) | 40 TFSI (204 Hp) quattro ultra Mild Hybrid S tronic |
| Start of production | July, 2020 |
| End of production | 2024 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 6.3-7.1 l/100 km (37.3 – 33.1 US mpg) |
| CO2 emissions (WLTP) | 142-162 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.7 sec |
| Acceleration 0 – 62 mph | 6.7 sec |
| Acceleration 0 – 60 mph | 6.4 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 7.6 kg/Hp |
| Weight-to-torque ratio | 4.9 kg/Nm |
| 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 | 1560 kg (3439.21 lbs.) |
| Max. weight | 2140 kg (4717.89 lbs.) |
| Max load | 580 kg (1278.68 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Fuel tank capacity | 58 l (15.32 US gal | 12.76 UK gal) |
| Length | 4762 mm (187.48 in.) |
| Width | 1847 mm (72.72 in.) |
| Height | 1431 mm (56.34 in.) |
| Wheelbase | 2820 mm (111.02 in.) |
| Number of gears and type of gearbox | 7 gears, automatic transmission S tronic |
Powertrain & Engine Architecture
At the heart of the A4 40 TFSI lies the DMSA engine, a 2.0-liter turbocharged inline-four cylinder gasoline engine. This engine is part of Audi’s EA888 family, known for its robust design and tuning potential. The DMSA utilizes direct fuel injection, delivering fuel directly into the combustion chamber for improved efficiency and power. A single twin-scroll turbocharger, coupled with an intercooler, provides forced induction, boosting power output. The engine features variable valve timing on both the intake and exhaust sides, optimizing performance across the rev range. The mild hybrid system incorporates a 12V lithium-ion battery and a belt-driven starter-generator. This system allows for extended start-stop operation, regenerative braking, and a slight power boost during acceleration. The seven-speed S tronic dual-clutch transmission delivers rapid and seamless gear changes, contributing to both performance and fuel efficiency. This transmission features a wet clutch design for improved durability and heat dissipation.
Driving Characteristics
The 204 horsepower and 320 Nm (236 lb-ft) of torque delivered by the 40 TFSI engine provide brisk acceleration. The 0-60 mph sprint takes approximately 6.4 seconds, making it a competitive performer in its class. The S tronic transmission’s quick shifts and the quattro ultra all-wheel-drive system ensure excellent traction and stability, particularly in adverse weather conditions. Compared to the more powerful 45 TFSI variant, the 40 TFSI offers a slightly more relaxed driving experience, prioritizing fuel economy over outright performance. While the 45 TFSI provides a more engaging and sporty feel, the 40 TFSI remains capable and responsive for everyday driving. The quattro ultra system intelligently switches between front-wheel drive and all-wheel drive as needed, further optimizing fuel efficiency.
Equipment & Trim Levels
The A4 40 TFSI quattro ultra Mild Hybrid S tronic typically came well-equipped as standard. Features included Audi’s MMI infotainment system with a 10.1-inch touchscreen display, Apple CarPlay and Android Auto integration, a digital instrument cluster (Audi Virtual Cockpit was often optional), leather upholstery, three-zone automatic climate control, and a suite of driver-assistance systems such as lane departure warning and forward collision warning. Optional extras included navigation, a premium sound system (Bang & Olufsen), adaptive cruise control, and a head-up display. Trim levels varied by market, but generally offered packages that added features like sport seats, upgraded interior trim, and exterior styling enhancements.
Chassis & Braking
The A4 B9 utilizes a sophisticated chassis design featuring an independent multi-link suspension at both the front and rear. This setup provides a comfortable ride quality while maintaining precise handling characteristics. The quattro ultra all-wheel-drive system contributes to enhanced stability and cornering grip. Braking duties are handled by ventilated disc brakes at the front and solid disc brakes at the rear. The electronic stability control (ESC) system and anti-lock braking system (ABS) work in conjunction to provide safe and controlled braking performance. Steering is provided by an electromechanical power steering system, offering precise and responsive control.
Market Reception & Comparison
The Audi A4 40 TFSI quattro ultra Mild Hybrid S tronic was generally well-received by automotive critics. It was praised for its refined driving experience, comfortable interior, and advanced technology. Fuel economy was a strong point, thanks to the mild hybrid system and the quattro ultra all-wheel-drive system’s ability to operate in front-wheel drive when appropriate. Compared to the higher-output 45 TFSI variant, the 40 TFSI offered a more affordable entry point into the A4 range, making it an attractive option for buyers prioritizing value and efficiency. Reliability reports have been generally positive, with the EA888 engine proving to be a durable and dependable unit.
Legacy
The Audi A4 40 TFSI quattro ultra Mild Hybrid S tronic represents a significant step in Audi’s pursuit of combining performance, efficiency, and technology. The EA888 engine continues to be a mainstay in the Volkswagen Group’s lineup, and the S tronic transmission remains a benchmark for dual-clutch technology. On the used car market, these A4s are generally sought after for their blend of luxury, practicality, and reliability. Regular maintenance, including oil changes and adherence to the manufacturer’s recommended service intervals, is crucial for ensuring the long-term health of the engine and transmission. The mild hybrid system has proven to be relatively trouble-free, adding to the overall dependability of this variant.
