If troubleshooting steps don't resolve the issue, consider the following solutions:
Windows 10 and 11 often try to install "generic" USB-to-Serial drivers that are too new for the older VAG Tacho hardware. vag tacho interface not found full
Remember: VAG Tacho is a tool of precision. It needs low latency, stable voltage, and a predictable USB stack. Give it those three things, and the "Full" error will become a distant memory. If troubleshooting steps don't resolve the issue, consider