Modern cars are no longer just about the engine — they’re controlled by a "brain": the control unit (ECU). This electronics system manages not only the engine, but also the transmission, brakes, air conditioning, airbags, and more. The ECU also records faults and operational data. To access this information, we use vehicle diagnostics – a tool that reads error codes, sensor data, and module status. Diagnostics help us to accurately identify what’s going on in your vehicle and to prevent more serious issues. It also helps to directly fix certain settings or faults.