Logic of naming actuators in VW-group is simple it contains "N" + actuator number. The actuator number is unique. Here you can find fitting location, connectors and some basic information about actuators.

To our mind, actuators information is reference, so there is only simple search by number.


Audi A8 4E (2002 -)
Audi A6 4F (2005- )
Audi A5 8T (2008- )

Servotronic valve


The control unit operates an electrohydraulic control element in the steering gear of the power steering dependent on the vehicle speed. The basic function is control of a proportional valve dependent on the road speed. The valve is controlled by way of a current controller. The specified current for control of the valve current is determined on the basis of a characteristic dependent on the vehicle speed. The valve restricts the hydraulic flow through the hydraulic bypass of the steering system according to the map.

When an engine speed >500 rpm is maintained for at least 500 ms, the power stage for the current control is enabled in the ongoing ignition process.

If the Servotronic fails the power steering remains operational. The power steering assistance is no longer adapted to the road speed however.


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