Engine Volkswagen AKN

The 2.5-liter Volkswagen AKN 2.5 TDI diesel engine was produced from 1999 to 2003 and was installed on the popular Passat B5, as well as Audi A4 B5, A6 C5 and A8 D2 models. This power unit is essentially a version of the well-known AFB engine updated to EURO 3.

The EA330 series also includes: AFB, AKE, AKN, AYM, BAU, BDG, BDH.


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
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

  • Most of the complaints are related to the rapid wear of the camshaft cams or rockers;
  • Many problems are caused by frequent failures of the Bosch VP44 electronically controlled high-pressure fuel pump;
  • This motor is also extremely prone to oil leaks at the joints and from under the valve cover;
  • On a run of more than 150,000 km, the mechanism for changing the geometry of the turbine may wedge;
  • The weak points of the engine also include the viscous coupling bearing and pressure reducing valves.

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