Allroad Quattro V6-2.7L Turbo (APB) (2002)
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Switch the ignition off.
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Disconnect the control modules connected via the bus lines and check whether one of the bus lines has a breakage.
Electrical Wiring Diagrams, Troubleshooting & Component Locations
Example 2:
The codes stored in the DTC memory enable you to establish that Control Module 2 has no connection to Control Modules 1 and 3.
