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Hi, I recently had my 2006 Audi A4 inspected because the OBD system won’t communicate and scanners keep showing a link error. The shop diagnosed it as a K-line communication issue, likely wiring damage or a module pulling the signal down, but they weren’t able to fix it. I’m looking for someone experienced with Audi/electrical diagnostics who can trace and repair the issue. If this is something you think you can help with, please let me know. Thanks! Official diagnosis below: Findings: • OBD scanner shows “link error” (no communication) • Verified power and ground at OBD port • Tested Pin 7 (K-line communication wire): reading ~0.1V (should be ~10–12V) → Indicates communication line is being pulled low or shorted Actions performed: • Checked and isolated common causes of K-line interference: • Radio circuit • ABS system • Related fuses • No change after isolating these components Conclusion: There is a fault in the K-line communication circuit, likely due to wiring damage or a module pulling the signal down. This prevents communication with the vehicle’s control modules and blocks proper diagnostics. Recommendation: The K-line issue must be resolved first. This requires electrical/wiring diagnosis, which is a specialized process involving tracing the communication line through the vehicle. I recommend consulting a technician or shop that specializes in automotive electrical diagnostics and wiring repair. Once communication is restored, I can proceed with full diagnostics, identify the cause of the warning lights, and complete any necessary repairs.

My Audi a4 needs electrical work done so that it can run. I had another mechanic lol at it and he did some work so I just need it diagnosed and fixed so that I can be able to crank and start.

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