The Audi A4 (B8 8K) 2.0 TDI, producing 170 horsepower, was a significant variant within the fourth generation of Audi’s popular compact executive car. Introduced in 2008 and continuing through 2011, this model played a crucial role in Audi’s European sales strategy, offering a balance of performance, fuel efficiency, and refinement. It occupied a mid-range position in the B8 A4 lineup, slotting between the lower-powered TDI engines and the more potent petrol variants like the 2.0 TFSI. This version was primarily aimed at drivers seeking a comfortable and economical daily driver with respectable performance for highway cruising and occasional spirited driving.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 (B8 8K) |
| Type (Engine) | 2.0 TDI (170 Hp) |
| Start of production | 2008 |
| End of production | 2011 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 6.2 l/100 km (37.9 US mpg, 45.6 UK mpg, 16.1 km/l) |
| Fuel consumption (extra urban) | 4.4 l/100 km (53.5 US mpg, 64.2 UK mpg, 22.7 km/l) |
| Fuel consumption (combined) | 5.1 l/100 km (46.1 US mpg, 55.4 UK mpg, 19.6 km/l) |
| CO2 emissions | 134 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 8.4 sec |
| Acceleration 0 – 62 mph | 8.4 sec |
| Acceleration 0 – 60 mph | 8 sec |
| Maximum speed | 230 km/h (142.92 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 8.6 kg/Hp, 116 Hp/tonne |
| Weight-to-torque ratio | 4.2 kg/Nm, 238.9 Nm/tonne |
| Power | 170 Hp @ 4200 rpm |
| Torque | 350 Nm @ 1750-2500 rpm (258.15 lb.-ft. @ 1750-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EA189 / CAHA |
| 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 | 16.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 5 l (5.28 US qt | 4.4 UK qt) |
| Kerb Weight | 1465 kg (3229.77 lbs.) |
| Max. weight | 2015 kg (4442.31 lbs.) |
| Max load | 550 kg (1212.54 lbs.) |
| Trunk (boot) space – minimum | 480 l (16.95 cu. ft.) |
| Trunk (boot) space – maximum | 962 l (33.97 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal | 14.3 UK gal) |
| Length | 4703 mm (185.16 in.) |
| Width | 1826 mm (71.89 in.) |
| Height | 1427 mm (56.18 in.) |
| Wheelbase | 2808 mm (110.55 in.) |
| Front track | 1564 mm (61.57 in.) |
| Rear (Back) track | 1551 mm (61.06 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle | 11.5 m (37.73 ft.) |
| Drivetrain Architecture | ICE, Front wheel drive |
| Drive wheel | Front wheel drive |
| Number of gears | 6 gears, manual transmission |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 225/55 R16 |
| Wheel rims size | 7.5J x 16 |
INTRODUCTION
The Audi A4 (B8) 2.0 TDI 170 hp, produced from 2008 to 2011, represented a key offering in Audi’s lineup during a period of significant growth for the brand. Built on the Volkswagen Group’s 1HX0/A3 platform, the B8 A4 aimed to deliver a more sophisticated and refined driving experience than its predecessor. The 2.0 TDI 170 hp variant was specifically designed to appeal to European buyers prioritizing fuel economy and reasonable performance, making it a popular choice for both private and fleet customers. It offered a compelling alternative to petrol engines, capitalizing on the growing demand for diesel power in Europe.
Powertrain & Engine Architecture
At the heart of the A4 2.0 TDI 170 hp lies the EA189 series engine, specifically the CAHA code. This 1968cc inline-four cylinder diesel engine featured common rail direct injection, delivering fuel at extremely high pressure for optimized combustion. The engine employed a turbocharger with an intercooler to boost power output and improve efficiency. The valvetrain utilized a dual overhead camshaft (DOHC) configuration with four valves per cylinder, enhancing breathing and contributing to the engine’s overall performance. The 6-speed manual transmission was standard, providing precise gear changes and contributing to the car’s engaging driving experience. The engine’s design prioritized low-end torque, making it well-suited for everyday driving conditions.
Driving Characteristics
The 2.0 TDI 170 hp A4 offered a balanced driving experience. While not as overtly sporty as the higher-powered petrol variants, it provided ample power for comfortable highway cruising and confident overtaking. The maximum torque of 350 Nm (258 lb-ft) available from 1750-2500 rpm ensured strong acceleration in everyday driving situations. The 6-speed manual transmission allowed drivers to effectively utilize the engine’s powerband. Compared to the 120 hp TDI, the 170 hp version offered a noticeable performance improvement, while remaining more economical than the 2.0 TFSI petrol engine. The gear ratios were tuned for a blend of fuel efficiency and responsiveness, making it a practical and enjoyable car to drive.
Equipment & Trim Levels
The A4 2.0 TDI 170 hp typically came equipped with a respectable level of standard features. These included air conditioning, power windows, central locking, and an audio system. Higher trim levels, such as SE and S-line, added features like alloy wheels, upgraded interior trim, and parking sensors. Optional extras included leather upholstery, a sunroof, and a navigation system. The interior design was typically understated and functional, reflecting Audi’s commitment to quality and refinement. The dashboard layout was clean and intuitive, with logically placed controls.
Chassis & Braking
The B8 A4 featured a sophisticated chassis design, with independent multi-link suspension at both the front and rear. This setup provided a comfortable ride quality while maintaining good handling characteristics. The front suspension utilized ventilated disc brakes, while the rear brakes were typically solid discs. Anti-lock Braking System (ABS) was standard, enhancing safety and control during emergency braking. The suspension tuning was geared towards providing a balance between comfort and handling, making it suitable for a wide range of driving conditions. Stabilizer bars were included to reduce body roll during cornering.
Market Reception & Comparison
The Audi A4 2.0 TDI 170 hp was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and refined interior. Compared to other trims in the A4 lineup, the 2.0 TDI 170 hp offered a compelling balance of performance and economy. The 120 hp TDI was more economical but lacked the same level of performance, while the 2.0 TFSI petrol engine offered more power but at the expense of fuel economy. The 2.0 TDI 170 hp was often seen as the sweet spot in the range, appealing to drivers who wanted a practical and enjoyable car without sacrificing too much performance.
Legacy
The EA189 engine, while generally reliable, has been subject to some scrutiny regarding emissions compliance. However, the 2.0 TDI 170 hp powertrain, when properly maintained, has proven to be relatively durable. In the used car market, these A4s remain popular due to their reputation for reliability and fuel efficiency. They represent a good value proposition for buyers seeking a comfortable and well-equipped compact executive car. Regular maintenance, including oil changes and filter replacements, is crucial for ensuring the long-term health of the engine and transmission.
