He downloaded the file, plugged in his HEX-NET cable, and flashed his laptop to read the proprietary data. The software loaded: VCDS Exclusive Module - Log #178 .

VCDS 178 is not a fault code like P0171 (System Too Lean). It is a communication or execution error that occurs during manual coding or adaptation. Your check engine light will not turn on for error 178; it only appears on your laptop screen.

VCDS 17.8 is a versatile tool that can be used in a variety of situations, including:

: Scans all electronic control modules in the vehicle to identify stored fault codes (DTCs).