The popular Passat B5, as well as the Audi A4 B5, A6 C5, and A8 D2 models, were equipped with the 2.5-liter Volkswagen AKN 2.5 TDI diesel engine, which was manufactured between 1999 and 2003. In essence, this power unit is an upgraded EURO 3 version of the popular AFB engine.
AFB, AKE, AKN, AYM, BAU, BDG, and BDH are additional models in the EA330 series.
Specifications
| Production years | 1999-2003 |
| Displacement, cc | 2496 |
| Fuel system | direct injection |
| Power output, hp | 150 |
| Torque output, Nm | 310 |
| Cylinder block | cast iron V6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 78.3 |
| Piston stroke, mm | 86.4 |
| Compression ratio | 19.5 |
| Features | 2 x DOHC |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | VGT |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 6.0 |
| Fuel type | diesel |
| Euro standards | EURO 3 |
| Fuel consumption, L/100 km (for Volkswagen Passat 2000) — city — highway — combined |
9.8 5.2 6.8 |
| Engine lifespan, km | ~260 000 |
The engine was installed on:
- Audi A4 B5 (8D) in 1999 – 2001;
- Audi A6 C5 (4B) in 1999 – 2001;
- Audi A8 D2 (4D) in 1999 – 2000;
- Volkswagen Passat B5 (3B) in 1999 – 2003.
Disadvantages of the VW AKN engine
The majority of complaints are about the camshaft cams or rockers wearing out quickly;
The Bosch VP44 electronically controlled high-pressure fuel pump frequently fails, which results in numerous issues;
Additionally, this motor is very vulnerable to oil leaks at the joints and under the valve cover; the mechanism for altering the turbine’s geometry may wedge after more than 150,000 kilometers of operation;
The engine’s viscous coupling bearing and pressure-reducing valves are also weak points.