Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 Avant (B9 8W, facelift 2019) |
| Type (Engine) | 40 TDI (204 Hp) quattro ultra Mild Hybrid S tronic |
| Start of production | September, 2020 |
| End of production | 2024 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 5.2-6.0 l/100 km (45.2 – 39.2 US mpg, 54.3 – 47.1 UK mpg, 19.2 – 16.7 km/l) |
| CO2 emissions (WLTP) | 137-157 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.1 sec |
| Acceleration 0 – 62 mph | 7.1 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Power | 204 Hp @ 3800-4200 rpm |
| Torque | 400 Nm @ 1750-3250 rpm (295.02 lb.-ft. @ 1750-3250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | DTPA |
| Engine displacement | 1968 cm3 (120.09 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 81 mm (3.19 in.) |
| Piston Stroke | 95.5 mm (3.76 in.) |
| Compression ratio | 15.5:1 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 5.5 l (5.81 US qt | 4.84 UK qt) |
| Coolant | 11.9 l (12.57 US qt | 10.47 UK qt) |
| Kerb Weight | 1625 kg (3582.51 lbs.) |
| Max. weight | 2230 kg (4916.31 lbs.) |
| Max load | 605 kg (1333.8 lbs.) |
| Trunk (boot) space – minimum | 495 l (17.48 cu. ft.) |
| Fuel tank capacity | 58 l (15.32 US gal | 12.76 UK gal) |
| Length | 4762 mm (187.48 in.) |
| Width | 1847 mm (72.72 in.) |
| Height | 1460 mm (57.48 in.) |
| Wheelbase | 2820 mm (111.02 in.) |
| Drivetrain Architecture | All wheel drive (4×4). MHEV. |
| Number of gears and type of gearbox | 7 gears, automatic transmission S tronic |
The Audi A4 Avant (B9 8W) 40 TDI quattro ultra Mild Hybrid S tronic, produced from September 2020 to 2024, represents a significant iteration of Audi’s popular compact executive estate. This variant slots into the mid-range of the B9 facelift lineup, offering a blend of performance, efficiency, and practicality. It builds upon the foundation of the B9 platform – shared with the Volkswagen Passat and Škoda Superb – and incorporates Audi’s ‘ultra’ quattro all-wheel-drive system and mild-hybrid technology for improved fuel economy and reduced emissions. The “40 TDI” designation signifies a 2.0-liter turbocharged diesel engine producing 204 horsepower, paired with a seven-speed S tronic dual-clutch transmission.
Powertrain & Engine Architecture
The heart of the A4 Avant 40 TDI is the DTPA engine, a 2.0-liter inline-four cylinder diesel. This engine utilizes a common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A single turbocharger with an intercooler provides forced induction, boosting power and torque. The engine features 16 valves (four per cylinder) and a compression ratio of 15.5:1. The mild-hybrid system incorporates a 48-volt electrical system and a belt starter generator (BSG). This BSG allows for extended start-stop functionality, regenerative braking to recoup energy, and a small electric boost to assist the engine during acceleration. The seven-speed S tronic dual-clutch transmission offers rapid and smooth gear changes, contributing to both performance and efficiency. This transmission is known for its responsiveness and ability to anticipate driver inputs.
Driving Characteristics
The 204 horsepower and 400 Nm (295 lb-ft) of torque provide brisk acceleration, with a 0-60 mph time of around 6.7 seconds. While not as overtly sporty as higher-powered A4 variants, the 40 TDI offers ample power for everyday driving and comfortable highway cruising. The S tronic transmission keeps the engine in its optimal power band, resulting in a responsive feel. The quattro ultra all-wheel-drive system intelligently distributes torque between the front and rear axles as needed, enhancing traction and stability, particularly in adverse weather conditions. Compared to the manual transmission versions, the S tronic offers convenience and slightly quicker acceleration, but some enthusiasts may prefer the greater driver engagement of a manual gearbox. Compared to the more powerful 45 TDI, the 40 TDI prioritizes fuel economy over outright performance.
Equipment & Trim Levels
The 40 TDI quattro ultra typically came well-equipped, reflecting its position as a mid-range offering. Standard features often included Audi’s MMI infotainment system with a touchscreen display, Apple CarPlay and Android Auto integration, automatic climate control, and a suite of driver-assistance systems such as lane departure warning and automatic emergency braking. Interior upholstery was typically a combination of cloth and leatherette, with options for full leather available. Common optional extras included a sunroof, upgraded sound system, navigation system, and adaptive cruise control. Trim levels varied slightly by market, but generally offered progressive upgrades in terms of interior materials, exterior styling, and technology features.
Chassis & Braking
The A4 Avant utilizes a sophisticated independent suspension system, with multi-link setups at both the front and rear. This provides a comfortable ride quality while maintaining good handling characteristics. The quattro ultra system contributes to stability and cornering grip. Braking duties are handled by ventilated discs at the front and solid discs at the rear. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard features. The suspension tuning is geared towards comfort and refinement, making it a pleasant long-distance cruiser.
Market Reception & Comparison
The A4 Avant 40 TDI quattro ultra was generally well-received by automotive critics. It was praised for its blend of performance, efficiency, and practicality. Fuel economy figures of 5.2-6.0 l/100 km (45.2-39.2 US mpg) were considered competitive for its class. Compared to the higher-output 45 TDI, the 40 TDI offered a more affordable entry point into the A4 Avant range, albeit with slightly less power. The mild-hybrid system was seen as a positive step towards reducing emissions. Reliability reports generally indicate good dependability, although diesel particulate filter (DPF) issues can occur with infrequent long-distance driving.
Legacy
The A4 Avant 40 TDI quattro ultra Mild Hybrid S tronic represents a well-rounded and technologically advanced compact executive estate. Its combination of a fuel-efficient diesel engine, sophisticated all-wheel-drive system, and comfortable interior has made it a popular choice in the used car market. The DTPA engine, while complex, has proven to be relatively durable when properly maintained. The mild-hybrid technology, while not a full hybrid system, demonstrates Audi’s commitment to improving fuel economy and reducing emissions. As a used vehicle, it offers a compelling blend of practicality, performance, and refinement, making it a strong contender in its segment.
