V70
V70 is a solenoid valve that controls boost pressure in turbocharged engines. It's part of the turbocharger control system. Its failure can result in engine performance issues or error codes in the car's computer system.
Swap Manual Climatic AC to Climatronic AC – part 1: comparison, theory
Air conditioning in VW Polo 6R – control unit comparison: Manual Climatic J301 vs Climatronic J255