While newer "clones" (V10.05, V11.xx, etc.) exist, the V9.31 version is widely regarded by the tuning community as the most stable "safe" version for high-quality clones. It strikes a balance between modern vehicle support and reliability, reducing the risk of "killing" an ECU during read/write operations.

Unlike later "online" versions (like V8.21), V9.31 is an offline version that works without activation, though it is often restricted to Windows XP systems.

CarProg 931 is a diagnostic software designed to work with a variety of vehicle systems, including engine control units (ECUs), transmission control units (TCUs), and other electronic control modules. The software is used to diagnose and repair problems with modern vehicles, as well as to program and configure various vehicle systems. CarProg 931 is widely used by professional mechanics, car enthusiasts, and automotive repair shops due to its ease of use, versatility, and accuracy.

The 9.31 software suite is engineered to act as an all-in-one diagnostic and programming interface. Key features include:

Common limitations and risks