The Audi A4 allroad 40 TDI (204 hp) quattro ultra Mild Hybrid S tronic, produced from July 2020 to 2024, represents a specific configuration within the B9 (8W) generation of the A4 allroad. This variant, positioned as a mid-range offering, combines a 2.0-liter turbocharged diesel engine with a seven-speed S tronic dual-clutch transmission and Audi’s quattro ultra all-wheel-drive system, enhanced by mild hybrid technology. The allroad designation signifies a focus on enhanced practicality and all-weather capability compared to the standard A4 sedan or Avant (wagon), appealing to buyers seeking a versatile premium vehicle. This model was primarily marketed in Europe and other regions where wagon-bodied vehicles remain popular, offering a blend of performance, efficiency, and ruggedness.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 allroad (B9 8W, facelift 2019) |
| Type (Engine) | 40 TDI (204 Hp) quattro ultra Mild Hybrid S tronic |
| Start of production | July, 2020 |
| End of production | 2024 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Station wagon (estate), Crossover |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 5.6-6.0 l/100 km (42 – 39.2 US mpg) |
| CO2 emissions (WLTP) | 146-157 g/km |
| Fuel consumption (urban) | 5.6-5.7 l/100 km (42 – 41.3 US mpg) |
| Fuel consumption (extra urban) | 4.3-4.5 l/100 km (54.7 – 52.3 US mpg) |
| Fuel consumption (combined) | 4.8-4.9 l/100 km (49 – 48 US mpg) |
| CO2 emissions (NEDC) | 126-130 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.3 sec |
| Acceleration 0 – 62 mph | 7.3 sec |
| Acceleration 0 – 60 mph | 6.9 sec |
| Maximum speed | 232 km/h (144.16 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 8.1 kg/Hp |
| Weight-to-torque ratio | 4.1 kg/Nm |
| Power | 204 Hp @ 3800-4200 rpm |
| Torque | 400 Nm @ 1750-3250 rpm (295.02 lb.-ft.) |
| 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 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 5.5 l (5.81 US qt | 4.84 UK qt) |
| Coolant capacity | 11.9 l (12.57 US qt | 10.47 UK qt) |
| Kerb Weight | 1645 kg (3626.6 lbs.) |
| Max. weight | 2250 kg (4960.4 lbs.) |
| Max load | 605 kg (1333.8 lbs.) |
| Trunk (boot) space – minimum | 495 l (17.48 cu. ft.) |
| Trunk (boot) space – maximum | 1495 l (52.8 cu. ft.) |
| Fuel tank capacity | 58 l (15.32 US gal | 12.76 UK gal) |
| AdBlue tank capacity | 12 l (3.17 US gal | 2.64 UK gal) |
| Max. roof load | 90 kg (198.42 lbs.) |
| Permitted trailer load (8%) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load (unbraked) | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4762 mm (187.48 in.) |
| Width | 1847 mm (72.72 in.) |
| Width including mirrors | 2022 mm (79.61 in.) |
| Height | 1493 mm (58.78 in.) |
| Wheelbase | 2818 mm (110.94 in.) |
| Front track | 1578 mm (62.13 in.) |
| Rear track | 1566 mm (61.65 in.) |
| Drag coefficient (Cd) | 0.32 |
| Minimum turning circle | 11.7 m (38.39 ft.) |
| Drivetrain Architecture | ICE & Electric Motor (Front Drive, Rear Drive on Demand) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 7 |
| Gearbox type | Automatic transmission S tronic |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
Powertrain & Engine Architecture
The heart of the A4 allroad 40 TDI is the DTPA engine, a 2.0-liter inline-four cylinder diesel engine. 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 four valves 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), enabling features like extended start-stop operation, coasting with the engine switched off, and a small power boost during acceleration. The seven-speed S tronic dual-clutch transmission offers quick and smooth gear changes, contributing to both performance and efficiency. This transmission is known for its responsiveness and ability to handle the engine’s torque output effectively.
Driving Characteristics
The 204 hp and 400 Nm (295 lb-ft) of torque delivered by the 40 TDI powertrain provide a comfortable and capable driving experience. Acceleration from 0 to 100 km/h (0-62 mph) takes approximately 7.3 seconds. While not a sports car, the engine offers ample power for everyday driving and overtaking maneuvers. The S tronic transmission contributes to a seamless power delivery, and the quattro ultra all-wheel-drive system provides excellent traction in various weather conditions. Compared to the higher-output TDI variants, this 40 TDI offers a more balanced focus on fuel economy and refinement. The gear ratios are tuned for a blend of responsiveness and efficiency, prioritizing mid-range torque for everyday usability. The mild hybrid system subtly enhances the driving experience by smoothing out engine restarts and providing a slight power boost when needed.
Equipment & Trim Levels
The A4 allroad 40 TDI typically came well-equipped as standard. Features included Audi’s MMI infotainment system with a touchscreen display, automatic climate control, leather upholstery, and a suite of driver-assistance systems such as lane departure warning and automatic emergency braking. The allroad-specific features included a raised suspension, roof rails, and unique exterior trim elements. Optional extras included a virtual cockpit digital instrument cluster, a premium sound system, and adaptive cruise control. Interior trim options varied, allowing buyers to personalize the cabin with different wood or aluminum inlays.
Chassis & Braking
The A4 allroad features a sophisticated chassis designed to balance comfort and handling. Independent multi-link suspension is used on both the front and rear axles, providing a smooth and controlled ride. The raised suspension of the allroad variant increases ground clearance, enhancing its off-road capability. Braking duties are handled by ventilated discs at the front and solid discs at the rear. The anti-lock braking system (ABS) and electronic stability control (ESC) are standard features, ensuring safe and confident braking performance.
Market Reception & Comparison
The A4 allroad 40 TDI was generally well-received by automotive critics. It was praised for its comfortable ride, spacious interior, and all-weather capability. The 40 TDI engine was considered a good compromise between performance and fuel economy. Compared to the more powerful TDI variants, the 40 TDI offered a lower price point and slightly better fuel efficiency. However, some critics noted that it lacked the outright performance of its more potent siblings. Against competitors like the BMW 3 Series Touring and Mercedes-Benz C-Class Estate, the A4 allroad stood out with its standard all-wheel drive and rugged styling.
Legacy
The DTPA engine, in various iterations, has proven to be a reliable and durable powertrain. The S tronic transmission, while requiring more diligent maintenance than a traditional automatic, is generally considered robust when properly serviced. The A4 allroad 40 TDI, as a used car, represents a good value proposition for buyers seeking a practical and refined premium wagon. Common maintenance items include regular oil changes, timing belt replacement (depending on mileage), and inspection of the turbocharger and fuel injection system. The mild hybrid system components are generally reliable, but battery health should be checked on older models.
