2020-2025 Audi A4 (B9 8W facelift ) 45 TFSI (265 Hp) quattro ultra Mild Hybrid S tronic

The Audi A4 (B9 8W) facelift, specifically the 45 TFSI quattro ultra Mild Hybrid S tronic model produced from July 2020 to 2025, represents a significant evolution of Audi’s popular executive sedan. Positioned as a mid-to-upper trim level within the B9 generation, this variant blended performance, efficiency, and advanced technology. It builds upon the foundation of the B9 platform (shared with the Volkswagen Passat and Škoda Superb) and incorporates a 48-volt mild hybrid system to enhance fuel economy and reduce emissions. This model was primarily aimed at the European and North American markets, offering a compelling alternative to rivals like the BMW 3 Series and Mercedes-Benz C-Class.

Technical Specifications

Powertrain & Engine Architecture

At the heart of the 45 TFSI lies the DMTA 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 DMTA utilizes direct fuel injection, delivering fuel directly into the combustion chamber for improved efficiency and power. The turbocharger, coupled with an intercooler, provides increased air density for enhanced performance. Crucially, this variant incorporates a 48-volt mild hybrid system. This system features a belt-driven starter-generator (BSG) that recovers energy during deceleration and stores it in a small battery. This stored energy can then assist the engine during acceleration, reducing load on the engine and improving fuel economy. The S tronic 7-speed dual-clutch transmission is standard, offering quick and smooth gear changes. This transmission is known for its efficiency and responsiveness, contributing to the overall driving experience.

Driving Characteristics

The 45 TFSI quattro ultra delivers a refined and engaging driving experience. The 265 horsepower and 272.9 lb-ft of torque provide ample power for both city driving and highway cruising. Acceleration from 0 to 60 mph in approximately 5.2 seconds is brisk, placing it firmly in the performance sedan category. The S tronic transmission contributes to seamless gear changes, minimizing power interruption. The quattro ultra all-wheel-drive system intelligently distributes torque between the front and rear axles, providing enhanced traction and stability in various driving conditions. Compared to lower-powered A4 variants (like the 40 TFSI), the 45 TFSI offers a noticeable increase in performance. While not as overtly sporty as the S4, it provides a satisfying balance of power and refinement. Compared to the diesel-powered A4 models (like the 35 TDI), the 45 TFSI prioritizes responsiveness and a more engaging engine character, though it may not match the diesel’s fuel economy.

Equipment & Trim Levels

The 45 TFSI quattro ultra typically came well-equipped as standard. Interior features included leather upholstery, three-zone automatic climate control, and Audi’s Virtual Cockpit – a fully digital instrument cluster. The MMI touch response infotainment system, with its dual touchscreen displays, provided access to navigation, entertainment, and vehicle settings. Standard safety features included Audi pre sense basic, lane departure warning, and automatic emergency braking. Optional extras included a Bang & Olufsen sound system, adaptive cruise control, a head-up display, and matrix LED headlights. Trim levels varied slightly by market, but generally offered packages that added features like sport seats, upgraded interior trim, and advanced driver-assistance systems.

Chassis & Braking

The A4 B9 utilizes a sophisticated suspension system designed to balance comfort and handling. The front suspension features a multi-link setup, while the rear also employs a multi-link design. This configuration provides excellent wheel control and a comfortable ride. The quattro ultra system’s ability to decouple the rear axle when not needed contributes to fuel efficiency without compromising handling when all-wheel drive is required. Braking duties are handled by ventilated discs at all four corners. The braking system is responsive and provides ample stopping power. Electronic stability control (ESC) and anti-lock braking system (ABS) are standard features, enhancing safety and control.

Market Reception & Comparison

The Audi A4 45 TFSI quattro ultra Mild Hybrid S tronic was generally well-received by automotive critics. Reviewers praised its refined engine, responsive transmission, and comfortable ride. The mild hybrid system was noted for its contribution to improved fuel economy without significantly impacting performance. Comparisons to rivals like the BMW 330i and Mercedes-Benz C300 often highlighted the A4’s sophisticated interior and user-friendly technology. Fuel economy figures of 7.4-8.3 l/100 km (31.8 – 28.3 US mpg) were competitive within its segment. Reliability reports generally indicated good overall reliability, although some owners reported minor issues with the infotainment system.

Legacy

The 45 TFSI quattro ultra Mild Hybrid S tronic represents a key step in Audi’s transition towards electrification. The integration of the 48-volt mild hybrid system demonstrated Audi’s commitment to improving fuel efficiency and reducing emissions. On the used car market, these models hold their value relatively well, due to their desirable combination of performance, technology, and refinement. The EA888 engine is known for its durability, and with proper maintenance, these A4s are expected to provide many years of reliable service. The S tronic transmission, while generally reliable, may require servicing at higher mileages. Overall, the A4 45 TFSI quattro ultra remains a compelling choice for buyers seeking a premium executive sedan with a blend of performance, efficiency, and advanced technology.