The Audi A4 (B9 8W) facelift, specifically the 45 TFSI quattro ultra S tronic model, represents a significant refinement of the fifth-generation A4. Introduced for the 2019 model year, this variant occupied a sweet spot in the A4 lineup, offering a compelling blend of performance, technology, and all-weather capability. It builds upon the B9 platform (introduced in 2016) with styling updates and powertrain enhancements. The “45 TFSI” designation, part of Audi’s revised naming scheme, indicates a power output level rather than literal engine displacement. This model was primarily marketed in North America and Europe, catering to buyers seeking a premium sport sedan with sophisticated technology.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 (B9 8W, facelift 2018) |
| Type (Engine) | 45 TFSI (245 Hp) quattro ultra S tronic |
| Start of production | 2019 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 8.4-8.6 l/100 km (28 – 27.4 US mpg) |
| Fuel consumption (extra urban) | 5.2-5.6 l/100 km (45.2 – 42 US mpg) |
| Fuel consumption (combined) | 6.4-6.7 l/100 km (36.8 – 35.1 US mpg) |
| CO2 emissions | 146-153 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.8 sec |
| Acceleration 0 – 62 mph | 5.8 sec |
| Acceleration 0 – 60 mph | 5.5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d – TEMP |
| Weight-to-power ratio | 6.3 kg/Hp |
| Weight-to-torque ratio | 4.2 kg/Nm |
| Power | 245 Hp @ 5000-6500 rpm |
| Torque | 370 Nm @ 1600-4300 rpm (272.9 lb.-ft. @ 1600-4300 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | DKNA |
| 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) |
| Kerb Weight | 1540 kg (3395.12 lbs.) |
| Max. weight | 2110 kg (4651.75 lbs.) |
| Max load | 570 kg (1256.63 lbs.) |
| Trunk (boot) space – minimum | 480 l (16.95 cu. ft.) |
| Fuel tank capacity | 58 l (15.32 US gal | 12.76 UK gal) |
| Max. roof load | 90 kg (198.42 lbs.) |
| Permitted trailer load with brakes (8%) | 1900 kg (4188.78 lbs.) |
| Permitted trailer load with brakes (12%) | 1700 kg (3747.86 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4738 mm (186.54 in.) |
| Width | 1842 mm (72.52 in.) |
| Width including 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 (Back) track | 1555 mm (61.22 in.) |
| Front overhang | 880 mm (34.65 in.) |
| Rear overhang | 1038 mm (40.87 in.) |
| Drivetrain Architecture | All wheel drive (4×4) |
| 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 | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 225/50 R17 |
| Wheel rims size | 7.5 J x 17 |
INTRODUCTION
The Audi A4 45 TFSI quattro ultra S tronic, launched in 2019 as part of the B9 facelift, represented a significant step forward in the A4’s evolution. Positioned as a mid-range offering, it slotted between the entry-level 40 TFSI and the performance-oriented 45 TFSI with sport suspension. The “ultra” designation within the quattro system signified Audi’s on-demand all-wheel-drive technology, prioritizing front-wheel drive for efficiency and engaging the rear axle when traction demands it. This model aimed to deliver a refined driving experience with a balance of power, efficiency, and all-weather capability, appealing to a broad spectrum of buyers in the premium compact executive segment.
Powertrain & Engine Architecture
At the heart of the 45 TFSI lies the 2.0-liter inline-four cylinder engine, internally designated as the DKNA code. This engine utilizes a single twin-scroll turbocharger and direct fuel injection to produce 245 horsepower at 5000-6500 rpm and 272.9 lb.-ft. of torque between 1600-4300 rpm. The engine features an aluminum block and head, contributing to its relatively lightweight construction. Audi’s Valvelift system, a variable valve lift technology, optimizes engine performance and efficiency by adjusting valve timing and lift based on driving conditions. The engine is paired with a seven-speed S tronic dual-clutch transmission, known for its quick and smooth shifts. This transmission allows for both fully automatic operation and manual gear selection via steering wheel-mounted paddles. The quattro ultra all-wheel-drive system dynamically distributes torque between the front and rear axles using a multi-plate clutch.
Driving Characteristics
The 45 TFSI quattro ultra S tronic delivers a responsive and engaging driving experience. The 245 hp engine provides ample power for both city driving and highway passing maneuvers. The S tronic transmission contributes to brisk acceleration, with a 0-60 mph time of approximately 5.5 seconds. The on-demand quattro system provides excellent traction in various weather conditions, enhancing stability and confidence. Compared to the base 40 TFSI, the 45 TFSI offers noticeably more power and a more spirited driving experience. While not as overtly sporty as the S4, the 45 TFSI provides a satisfying balance between comfort and performance. The gear ratios are tuned for a blend of acceleration and fuel efficiency, with seventh gear providing a comfortable cruising speed on the highway.
Equipment & Trim Levels
The 45 TFSI quattro ultra S tronic came standard with a generous array of features, including Audi’s Virtual Cockpit – a fully digital instrument cluster – leather upholstery, three-zone automatic climate control, and a 7-inch infotainment system with Apple CarPlay and Android Auto compatibility. Available options included a larger 8.3-inch infotainment screen with navigation, a Bang & Olufsen premium sound system, a panoramic sunroof, and a suite of advanced driver-assistance systems such as adaptive cruise control, lane keeping assist, and blind-spot monitoring. Interior trim options ranged from brushed aluminum to wood veneers, allowing buyers to personalize the cabin to their preferences.
Chassis & Braking
The A4 B9 utilizes a sophisticated suspension system designed to provide a comfortable yet controlled ride. The 45 TFSI model features independent multi-link suspension at both the front and rear axles. The suspension geometry is optimized to minimize body roll and maximize grip. Braking duties are handled by ventilated discs at all four corners, providing ample stopping power. The standard ABS (Anti-lock Braking System) and Electronic Stability Control (ESC) enhance safety and stability. The steering system is a rack-and-pinion setup with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The Audi A4 45 TFSI quattro ultra S tronic was generally well-received by automotive critics. Reviewers praised its refined driving experience, comfortable interior, and advanced technology. The fuel economy, averaging around 35 mpg combined, was considered competitive for its class. Compared to rivals like the BMW 330i and Mercedes-Benz C300, the A4 offered a slightly more understated and technologically advanced experience. The quattro ultra system, while efficient, was sometimes criticized for its occasional hesitation when engaging the rear axle. However, the overall consensus was that the 45 TFSI represented a compelling value proposition in the premium compact executive segment.
Legacy
The 2.0-liter turbocharged engine and S tronic transmission combination used in the A4 45 TFSI have proven to be remarkably reliable. With proper maintenance, these powertrains can easily exceed 150,000 miles. The quattro ultra system, while complex, has also demonstrated good long-term durability. On the used car market, the 2019 A4 45 TFSI quattro ultra S tronic holds its value well, reflecting its reputation for quality and reliability. It remains a popular choice for buyers seeking a premium sport sedan with all-wheel-drive capability and a sophisticated driving experience.
