Foxflash Failed to Read Audi DL501 TCU Solution

 If fails to read VAG DL501 gearbox TCU with foxflash, check if bench box is connected.

It cannot read if not connecting bench box.

Foxflash reads/writes DL501 TCU no problem, check

http://www.pcmtuner.org/foxflash-read-and-write-porsche-dl501-gen2-gearbox/

PCMTuner also read/write DL501 gearbox without issue.

For example:

Audi A6 TCU Dl501 read and write with PCM tuner success