Toyota Techstream is the official diagnostic and customization software used by Toyota technicians. When paired with a Mini VCI J2534 cable , it allows users to:

Toyota Techstream is the proprietary diagnostic software suite used by Toyota, Lexus, and Scion dealerships. It allows technicians to interface with a vehicle's On-Board Diagnostics (OBD) system to perform health checks, reprogram Electronic Control Units (ECUs), and customize vehicle settings.

Toyota requires a specific cable: the An original Toyota MVCI costs approximately $1,500. Chinese manufacturers sell clones (often called "Mini-VCI" or "J2534 Pass-thru") for $30 to $60.