The Audi A4 35 TFSI Mild Hybrid S tronic, produced from 2019 to 2020, represents a key iteration of the B9 (8W) generation A4, following the mid-cycle facelift. Positioned as a mainstream offering within the A4 lineup, this variant aimed to balance fuel efficiency with acceptable performance for everyday driving. It was primarily marketed in Europe and other regions where smaller displacement, turbocharged engines and automatic transmissions are highly favored. The introduction of mild hybrid technology further emphasized Audi’s commitment to improving fuel economy and reducing emissions. This model served as a stepping stone between the more basic trims and the higher-performance 40 TFSI and 45 TFSI versions.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 (B9 8W, facelift 2019) |
| Type (Engine) | 35 TFSI (150 Hp) Mild Hybrid S tronic |
| Start of production | 2019 |
| End of production | 2020 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 6.7-7.3 l/100 km (35.1 – 32.2 US mpg, 42.2 – 38.7 UK mpg, 14.9 – 13.7 km/l) |
| CO2 emissions (WLTP) | 150-165 g/km |
| Fuel consumption (urban) | 7.1-7.5 l/100 km (33.1 – 31.4 US mpg, 39.8 – 37.7 UK mpg, 14.1 – 13.3 km/l) |
| Fuel consumption (extra urban) | 4.6-5.1 l/100 km (51.1 – 46.1 US mpg, 61.4 – 55.4 UK mpg, 21.7 – 19.6 km/l) |
| Fuel consumption (combined) | 5.5-6.0 l/100 km (42.8 – 39.2 US mpg, 51.4 – 47.1 UK mpg, 18.2 – 16.7 km/l) |
| CO2 emissions | 125-136 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.9 sec |
| Acceleration 0 – 62 mph | 8.9 sec |
| Acceleration 0 – 60 mph | 8.5 sec |
| Maximum speed | 225 km/h (139.81 mph) |
| Emission standard | Euro 6d – TEMP – EVAP – ISC |
| Weight-to-power ratio | 9.6 kg/Hp |
| Weight-to-torque ratio | 5.3 kg/Nm |
| Power | 150 Hp @ 3900-6000 rpm |
| Torque | 270 Nm @ 1350-3900 rpm (199.14 lb.-ft. @ 1350-3900 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | DMSB |
| Engine displacement | 1984 cm3 (121.07 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 5.2 l (5.49 US qt | 4.58 UK qt) |
| Coolant capacity | 10 l (10.57 US qt | 8.8 UK qt) |
| Kerb Weight | 1440 kg (3174.66 lbs.) |
| Max. weight | 2035 kg (4486.41 lbs.) |
| Max load | 595 kg (1311.75 lbs.) |
| Fuel tank capacity | 54 l (14.27 US gal | 11.88 UK gal) |
| Max. roof load | 90 kg (198.42 lbs.) |
| Permitted trailer load (brakes 8%) | 1700 kg (3747.86 lbs.) |
| Permitted trailer load (brakes 12%) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load (no brakes) | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4762 mm (187.48 in.) |
| Width | 1847 mm (72.72 in.) |
| Width (mirrors) | 2022 mm (79.61 in.) |
| Height | 1428 mm (56.22 in.) |
| Wheelbase | 2820 mm (111.02 in.) |
| Front track | 1572 mm (61.89 in.) |
| Rear track | 1555 mm (61.22 in.) |
| Front overhang | 899 mm (35.39 in.) |
| Rear overhang | 1043 mm (41.06 in.) |
| Turning circle | 11.6 m (38.06 ft.) |
| Drivetrain | Front wheel drive, MHEV |
| Gearbox | 7-speed automatic S tronic |
| Front suspension | Independent multi-link |
| Rear suspension | Independent multi-link |
| Front brakes | Ventilated discs |
| Rear brakes | Discs |
INTRODUCTION
The Audi A4 35 TFSI Mild Hybrid S tronic, launched as part of the B9.5 facelift in 2019, represented a significant step towards electrification for the A4 range. Built on the Volkswagen Group’s MLB Evo platform (specifically the 1HX0/A3 variant for the A4), this model aimed to deliver a balance of performance, efficiency, and technology. The “35 TFSI” designation indicated a power output of 150 horsepower, while the “Mild Hybrid” label signified the inclusion of a 12V mild hybrid system designed to improve fuel economy and reduce emissions. This variant was positioned as an entry-level to mid-range option, appealing to buyers seeking a comfortable and technologically advanced sedan without the higher price tag of the more powerful engine options.
Powertrain & Engine Architecture
At the heart of the A4 35 TFSI lies the DMSB engine code, a 1.984-liter (121.07 cubic inches) inline-four cylinder gasoline engine. This engine utilizes direct fuel injection and is equipped with a single turbocharger and intercooler to boost power and efficiency. The engine’s architecture is characterized by its compact design and lightweight construction, contributing to the A4’s overall balanced handling. The mild hybrid system consists of a belt-driven starter generator (BSG) and a small lithium-ion battery. The BSG allows for extended engine-off coasting, regenerative braking, and a smoother start-stop system. The seven-speed S tronic dual-clutch transmission is standard, providing quick and seamless gear changes. This transmission is known for its efficiency and responsiveness, further enhancing the driving experience.
Driving Characteristics
The A4 35 TFSI S tronic delivers a comfortable and refined driving experience. While not overtly sporty, the 150 horsepower and 270 Nm (199.14 lb-ft) of torque provide adequate performance for everyday driving situations. Acceleration from 0 to 100 km/h (0-62 mph) takes approximately 8.9 seconds. The S tronic transmission contributes to smooth and quick gear changes, and the mild hybrid system helps to minimize turbo lag. Compared to the more powerful 40 TFSI and 45 TFSI variants, the 35 TFSI feels less urgent in acceleration, but it offers a more relaxed and fuel-efficient driving experience. The gear ratios are tuned for a balance of fuel economy and responsiveness, with a focus on providing sufficient torque in the lower gears for everyday driving.
Equipment & Trim Levels
The A4 35 TFSI typically came standard with a comprehensive list of features, including Audi’s MMI infotainment system with a 7-inch touchscreen display, automatic climate control, and a suite of driver-assistance systems such as lane departure warning and forward collision warning. Interior upholstery was typically cloth, with leather options available as upgrades. Standard dashboard trim included aluminum or wood accents. Optional extras included a larger touchscreen display, a digital instrument cluster (Audi Virtual Cockpit), a premium sound system, and a panoramic sunroof. Trim levels varied by market, but generally offered packages that bundled popular options together.
Chassis & Braking
The A4 35 TFSI utilizes an independent multi-link suspension system at both the front and rear axles, providing a comfortable and controlled ride. The suspension is tuned to prioritize comfort over outright sportiness, but still offers good handling characteristics. Front brakes are ventilated discs, while rear brakes are solid discs. The braking system is assisted by ABS (Anti-lock Braking System) and electronic stability control. The weight distribution is well-balanced, contributing to the A4’s predictable handling. Stabilizer bars are fitted to both axles to reduce body roll during cornering.
Market Reception & Comparison
The Audi A4 35 TFSI Mild Hybrid S tronic was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and advanced technology. However, some critics noted that the engine lacked the outright performance of the higher-output variants. Compared to the 40 TFSI, the 35 TFSI offered better fuel economy but slower acceleration. Compared to diesel-powered A4 models (such as the 30 TDI), the 35 TFSI offered a smoother and quieter driving experience, but typically at the expense of fuel economy. The mild hybrid system was seen as a positive step towards reducing emissions, but its impact on fuel economy was relatively modest.
Legacy
The Audi A4 35 TFSI Mild Hybrid S tronic represents an important step in Audi’s transition towards electrification. While the mild hybrid system may seem modest by today’s standards, it paved the way for the more advanced plug-in hybrid and fully electric models that followed. The DMSB engine proved to be relatively reliable, with few major issues reported. On the used car market, these models are generally sought after for their balance of fuel efficiency, comfort, and technology. Regular maintenance, including oil changes and timing belt replacements, is crucial for ensuring long-term reliability. The A4 B9.5 remains a popular choice for buyers seeking a premium compact sedan.
