A4 Quattro Sedan L4-1.8L Turbo (AWM) (2001)
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When necessary repairs have made:
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Check bus wires if communication to the control modules is still faulty. If yes, check bus wires.
There can be two situations:
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Two control modules communicate via a "two-line bus system"
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Three or more control modules communicate via a "two-line bus system"
Two control modules communicate via a "two-line bus system"
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Switch ignition off.
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Disconnect both control modules.
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Check bus wires for open circuit.
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Check whether there is a short circuit between bus wires.
