The Audi A4 Avant (B9 8W) 40 TDI quattro S tronic, produced from 2018 to 2019, represents a significant iteration of Audi’s popular compact executive estate car. This variant, part of the B9 generation’s facelift, positioned itself as a compelling blend of performance, efficiency, and practicality within the A4 Avant lineup. It catered to buyers seeking a refined driving experience coupled with the added security and capability of Audi’s quattro all-wheel-drive system and the convenience of a seven-speed S tronic dual-clutch transmission. The “40 TDI” designation reflects Audi’s power banding nomenclature, indicating a diesel engine output level. This model played a key role in Audi’s European sales strategy, offering a premium wagon option in a market segment dominated by BMW and Mercedes-Benz.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 Avant (B9 8W, facelift 2018) |
| Type (Engine) | 40 TDI (190 Hp) quattro S tronic |
| Start of production | 2018 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 5.8-5.9 l/100 km (40.6 – 39.9 US mpg, 48.7 – 47.9 UK mpg, 17.2 – 16.9 km/l) |
| Fuel consumption (extra urban) | 4.7-4.9 l/100 km (50 – 48 US mpg, 60.1 – 57.6 UK mpg, 21.3 – 20.4 km/l) |
| Fuel consumption (combined) | 5.1-5.3 l/100 km (46.1 – 44.4 US mpg, 55.4 – 53.3 UK mpg, 19.6 – 18.9 km/l) |
| CO2 emissions | 134-140 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.6 sec |
| Acceleration 0 – 62 mph | 7.6 sec |
| Acceleration 0 – 60 mph | 7.2 sec |
| Maximum speed | 230 km/h (142.92 mph) |
| Emission standard | Euro 6d – TEMP |
| Weight-to-power ratio | 8.5 kg/Hp, 117.6 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 247.7 Nm/tonne |
| Power | 190 Hp @ 3800-4200 rpm |
| Torque | 400 Nm @ 1750-3000 rpm (295.02 lb.-ft. @ 1750-3000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | DESA, DETA |
| Engine displacement | 1968 cm3 (120.09 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 4.7 l (4.97 US qt | 4.14 UK qt) |
| Kerb Weight | 1615 kg (3560.47 lbs.) |
| Max. weight | 2225 kg (4905.29 lbs.) |
| Max load | 610 kg (1344.82 lbs.) |
| Trunk (boot) space – minimum | 495 l (17.48 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%) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 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 | 1435 mm (56.5 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.) |
| Minimum turning circle (turning diameter) | 11.6 m (38.06 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives permanently the four wheels of the vehicle. |
| Drive wheel | 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 |
INTRODUCTION
The Audi A4 Avant (B9 8W) 40 TDI quattro S tronic, launched during the facelift of the B9 generation in 2018, is a five-door, five-seat station wagon designed to appeal to buyers prioritizing a blend of practicality, performance, and sophisticated technology. Positioned within Audi’s A4 Avant range, the 40 TDI variant offered a compelling alternative to petrol-powered models and served as a step up from the entry-level engine options. Built on the Volkswagen Group’s MLB Evo platform (1HX0/A3), this model benefited from advancements in weight reduction and chassis technology. The facelift brought subtle styling revisions, updated infotainment systems, and enhanced driver-assistance features, further solidifying the A4 Avant’s position in the competitive executive estate market.
Powertrain & Engine Architecture
At the heart of the A4 Avant 40 TDI lies the 2.0-liter inline-four cylinder diesel engine, specifically utilizing the DESA or DETA engine codes depending on minor production variations. This engine is a turbocharged common-rail direct injection diesel, producing 190 horsepower at 3800-4200 rpm and a substantial 400 Nm (295 lb-ft) of torque between 1750 and 3000 rpm. The engine features a single turbocharger with an intercooler to enhance efficiency and power output. The fuel injection system employs piezo injectors for precise fuel delivery and optimized combustion. Paired with this engine is Audi’s renowned seven-speed S tronic dual-clutch transmission. This transmission offers rapid, seamless gear changes and contributes to the car’s overall efficiency. The S tronic features a wet clutch design for improved heat dissipation and durability. Power is then distributed to all four wheels via Audi’s quattro all-wheel-drive system, utilizing a multi-plate clutch to dynamically manage torque distribution between the front and rear axles.
Driving Characteristics
The A4 Avant 40 TDI quattro S tronic delivers a refined and capable driving experience. The 190 hp engine and 400 Nm of torque provide ample power for everyday driving and confident overtaking maneuvers. While not as overtly sporty as higher-output A4 variants, the 40 TDI offers a broad torque curve, resulting in strong acceleration from low engine speeds. The S tronic transmission contributes to brisk acceleration, with smooth and quick gear changes. The quattro all-wheel-drive system provides excellent traction in various weather conditions, enhancing stability and control. Compared to the manual transmission versions, the S tronic offers greater convenience and slightly quicker acceleration. Compared to the more powerful 45 TDI, the 40 TDI prioritizes fuel efficiency and a more relaxed driving experience, making it well-suited for long-distance journeys.
Equipment & Trim Levels
The A4 Avant 40 TDI quattro S tronic typically came well-equipped as standard. Features included Audi’s MMI infotainment system with a 7-inch touchscreen display (upgradable to a larger screen with the Technology Package), tri-zone automatic climate control, leather upholstery, and a suite of driver-assistance systems such as Audi pre sense basic and lane departure warning. Optional extras included the Virtual Cockpit digital instrument cluster, a Bang & Olufsen sound system, adaptive cruise control, and a panoramic sunroof. Trim levels varied slightly depending on the market, but generally offered options to upgrade interior materials, add exterior styling enhancements, and include additional convenience features.
Chassis & Braking
The A4 Avant 40 TDI quattro S tronic utilizes a sophisticated suspension setup designed to balance comfort and handling. The front suspension features independent multi-link suspension, while the rear also employs a multi-link design. This configuration provides excellent ride quality and precise handling characteristics. The car is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) is standard, along with electronic brake-force distribution and brake assist. The quattro all-wheel-drive system contributes to enhanced braking stability, particularly on slippery surfaces.
Market Reception & Comparison
The A4 Avant 40 TDI quattro S tronic was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and sophisticated interior. Fuel economy was a particular strength, with combined fuel consumption figures ranging from 5.1 to 5.3 l/100 km. Compared to the higher-output 45 TDI variant, the 40 TDI offered a more affordable entry point into the A4 Avant range, while still providing a compelling level of performance and refinement. Its main competitors included the BMW 3 Series Touring and the Mercedes-Benz C-Class Estate, both of which offered similar levels of luxury and performance.
Legacy
The Audi A4 Avant (B9 8W) 40 TDI quattro S tronic has proven to be a reliable and durable vehicle. The 2.0-liter TDI engine, while subject to scrutiny regarding diesel emissions in the past, has generally demonstrated good long-term reliability when properly maintained. The S tronic transmission, while requiring regular servicing, is known for its smooth operation and durability. On the used car market, these models continue to hold their value well, reflecting their reputation for quality and refinement. They remain a popular choice for buyers seeking a practical, efficient, and well-equipped executive estate car.
