The Audi A4 45 TFSI S tronic, produced from 2019 as part of the B9 (8W) generation’s facelift, represents a significant iteration of Audi’s popular executive sedan. This variant, positioned as a mid-to-upper trim level, combines a potent 2.0-liter turbocharged four-cylinder engine with Audi’s renowned seven-speed S tronic dual-clutch transmission. The B9 facelift, introduced in 2019, brought styling updates, enhanced technology, and refined engine options to the A4 lineup, solidifying its position in the competitive luxury car segment. This specific 45 TFSI model was primarily marketed in Europe and North America, appealing to buyers seeking a balance of performance, efficiency, and sophisticated technology.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 (B9 8W, facelift 2018) |
| Type (Engine) | 45 TFSI (245 Hp) 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) | 8.3-8.4 l/100 km (28.3 – 28 US mpg, 34 – 33.6 UK mpg, 12 – 11.9 km/l) |
| Fuel consumption (extra urban) | 5.2-5.6 l/100 km (45.2 – 42 US mpg, 54.3 – 50.4 UK mpg, 19.2 – 17.9 km/l) |
| Fuel consumption (combined) | 6.3-6.6 l/100 km (37.3 – 35.6 US mpg, 44.8 – 42.8 UK mpg, 15.9 – 15.2 km/l) |
| CO2 emissions | 144-150 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.3 sec |
| Acceleration 0 – 62 mph | 6.3 sec |
| Acceleration 0 – 60 mph | 6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d – TEMP |
| Weight-to-power ratio | 6 kg/Hp, 166.7 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 251.7 Nm/tonne |
| Power | 245 Hp @ 5000-6500 rpm |
| Power per litre | 123.5 Hp/l |
| 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 | 1470 kg (3240.8 lbs.) |
| Max. weight | 2045 kg (4508.45 lbs.) |
| Max load | 575 kg (1267.66 lbs.) |
| Trunk (boot) space – minimum | 480 l (16.95 cu. ft.) |
| Fuel tank capacity | 54 l (14.27 US gal | 11.88 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 | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| 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 |
Powertrain & Engine Architecture
At the heart of the A4 45 TFSI lies the EA888 2.0-liter inline-four cylinder engine, specifically the DKNA variant. This engine is a direct-injection, turbocharged powerplant known for its responsiveness and efficiency. The direct injection system precisely meters fuel into the combustion chambers, optimizing combustion and reducing emissions. The turbocharger, coupled with an intercooler, provides a significant boost in power output. The engine utilizes a variable valve timing system on both the intake and exhaust sides, further enhancing performance and fuel economy. The seven-speed S tronic dual-clutch transmission is a key component, offering incredibly fast and smooth gear changes. Unlike a traditional automatic, the S tronic uses two separate clutches – one for odd gears and one for even gears – allowing for pre-selection of the next gear, resulting in near-instantaneous shifts. This transmission contributes significantly to the car’s sporty driving feel and improved fuel efficiency.
Driving Characteristics
The 245 horsepower and 272.9 lb.-ft. of torque delivered by the 45 TFSI powertrain translate into brisk acceleration. The 0-60 mph sprint is achieved in around 6 seconds, and the car feels confident during highway overtaking maneuvers. The S tronic transmission plays a crucial role in maximizing the engine’s output, providing seamless gear changes and keeping the engine within its optimal power band. Compared to the base 40 TFSI model, the 45 TFSI offers a noticeable performance upgrade. While not as overtly sporty as the S4, the 45 TFSI provides a satisfying balance of power and refinement. The gear ratios are tuned for a blend of acceleration and fuel efficiency, with taller gears for relaxed cruising on the highway. The front-wheel-drive configuration provides good traction in most conditions, although Audi’s quattro all-wheel-drive system was available as an option for enhanced grip.
Equipment & Trim Levels
The 45 TFSI S tronic typically came well-equipped as standard. Features included Audi’s MMI infotainment system with a 7-inch touchscreen display (larger screens were optional), automatic climate control, leather upholstery, and a suite of driver-assistance systems such as lane departure warning and automatic emergency braking. Optional extras included a virtual cockpit digital instrument cluster, a premium sound system, navigation, and adaptive cruise control. Interior trim levels varied, with options for different wood or aluminum inlays. The standard seats provided good support and comfort, and sport seats were available as an upgrade.
Chassis & Braking
The A4 B9 utilizes a sophisticated suspension setup designed to provide a comfortable yet engaging driving experience. The front suspension features MacPherson struts, while the rear employs a multi-link setup. This configuration minimizes body roll and provides precise handling. The 45 TFSI model typically came with ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) and electronic stability control were standard features. The steering is a rack-and-pinion system with electric power assistance, offering a responsive and precise feel.
Market Reception & Comparison
The Audi A4 45 TFSI S tronic was generally well-received by automotive critics. It was praised for its refined engine, smooth transmission, and comfortable ride. Compared to the base 40 TFSI model, the 45 TFSI offered a significant performance boost without sacrificing fuel economy. The S tronic transmission was lauded for its quick and seamless shifts. However, some critics noted that the front-wheel-drive configuration could sometimes struggle for traction in slippery conditions, and the optional quattro all-wheel-drive system was often recommended. Fuel economy figures were competitive for its class, averaging around 37 mpg in combined driving.
Legacy
The EA888 2.0-liter turbocharged engine has proven to be a remarkably durable and reliable powerplant. With proper maintenance, these engines can easily exceed 150,000 miles. The S tronic transmission, while more complex than a traditional automatic, is also generally reliable, although regular fluid changes are crucial. On the used car market, the A4 45 TFSI S tronic holds its value well, thanks to its reputation for quality, performance, and refinement. It remains a popular choice for buyers seeking a well-rounded luxury sedan that offers a compelling blend of driving enjoyment and everyday practicality.
