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Fault code 04120 on an Audi A6 2.7 TD1 typically relates to issues with the fuel system, often indicating a problem with fuel pressure or delivery. Fault code 05661, on the other hand, is usually associated with the vehicle's electronic control unit (ECU) and may indicate a communication issue or a malfunction in a specific sensor or component. It's important to use a diagnostic tool to confirm the exact nature of these faults and to check for any additional codes that could provide further insight into the problem.

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3mo ago

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