Steering: Service and Repair

General Repair Information

The maximum possible care, cleanliness and proper tools are essential to ensure satisfactory and successful steering gear repairs. Understandably, general safety guidelines apply when performing repairs.

A series of applicable general notes for individual repair procedures - otherwise listed several times at many points in the Repair Information - has been collected here. They apply for this Repair Information.

Steering Gear

• Thoroughly clean connecting points and their surrounding areas before loosening.

• When installing steering gear, make sure centering sleeves are correctly seated between console and steering gear.

• Place removed parts on a clean surface and cover to prevent contamination. Use foils and paper. Only use lint-free cloths!

• Only install clean components: Only unpack replacement parts immediately prior to installation.

• Use exclusively lubricants and sealants marked with part numbers.

• Carefully cover or seal open components, if repairs are not carried out immediately.

• As of MY 2009 steering gear generation 3 is being installed. Information on the differences between generation 2 and generation 3, refer to => [ Steering Gear, Generation 2 and Generation 3 Differences ] Steering Gear, Generation 2 and Generation 3 Differences.

Gaskets and Seals

• Always replace seals and gaskets.

• After removing seals, inspect contact surface on housings and shafts for burrs and damage and repair if necessary.

• Remove all residual sealant of fluid seals from sealing surfaces, no sealant residue must enter the steering gear housing when doing this.

Bolts and Nuts






• Loosen and tighten the bolts and nuts of covers and housings in a diagonal sequence.

• Do not cant but loosen and tighten especially sensitive parts in diagonal manner in stages, e.g. servo motor with control module.

• Torque specifications for unlubricated bolts and nuts are given.

• Always replace self-locking nuts and bolts.

Electrical Components

Surely everyone has been shocked at one time or another when coming into contact with a metal object. The reason for this is the build-up of static electricity in the human body. This charge can lead to functional problems by touching the electrical components of steering gear.

- Touch a grounded object - for example a water pipe or a vehicle hoist - before working on electrical components. Do not make direct contact on connector terminals.

Guided Fault Finding, OBD and Test Instruments






• Before performing repairs on electromechanical steering, the malfunction cause must be determined as exactly as possible using Vehicle Diagnostic Tester in operating modes "Guided Fault Finding", "Vehicle Self-Diagnosis" and "Test Instruments".