What of Audi or VW are you working on?
Usually refers to the .71 extension added to archived files, which is a common format for sharing this software.
Right-click the port -> -> Port Settings -> Advanced . Change the COM port number to COM1 , COM2 , COM3 , or COM4 .
The number "71" appearing in your request likely refers to the file size in kilobytes (approx. 71kb for the executable) or a specific build iteration found in "warez" or enthusiast distribution circles. The actual executable for VWTool is remarkably small by modern standards. This lightweight nature is part of its charm; it loads instantly and uses minimal system resources.
Audi VWTool (often stylized as VW-Tool or Audi-VW-Tool) is a third-party diagnostic application designed to interface with the onboard computers of vehicles from the Volkswagen Auto Group, including Audi, VW, SEAT, and Škoda. Unlike generic OBD-II scanners that read only basic engine fault codes, this tool delves deep into manufacturer-specific control modules.
Does not support newer CAN-Bus vehicles (roughly 2005 and newer).
This is the standard K-Line cable required.
Free or incredibly low-cost compared to modern professional tools. Accesses modules that generic OBD2 scanners cannot see.
: Specifically optimized for Windows 7 in this version, though typically requires a 32-bit (x86) architecture.
| Feature | Audi VWTool 2.0.9 | VCDS / VCDS-Lite (Modern Standard) | OBDeleven (Modern DIY Alternative) | | :--- | :--- | :--- | :--- | | | Free (after cable) | $99+ (Lite: $99 for full version) | ~$60+ (with credit system for advanced features) | | Supported Vehicles | Pre-2004 VAG (K-Line only) | Supports VAG vehicles from 1990 to present | 2008+ VAG (CAN-Bus required) | | Diagnostic Depth | Basic to intermediate | Dealer-level full system access | Full system access with guided long coding | | User Interface | 16-bit Visual Basic | Modern, refined Windows UI | Modern, intuitive smartphone app | | Support & Updates | None (abandoned since early 2000s) | Active, excellent support | Active community and support | | Primary Advantage | Free, lightweight, works on old PCs | The gold standard for VAG diagnostics | Convenient, portable (Bluetooth + phone) | | Primary Disadvantage | Extremely limited compatibility, unreliable on modern OS | Expensive, requires a PC | Recurring credit cost for advanced functions |
Displays real-time parameters such as engine RPM, coolant temperature, oxygen sensor voltages, and mass airflow (MAF) readings.