1. Engine and Transmission Computer Check (OBD-II Diagnostics) Fault Diagnosis: Reading stored fault codes (DTCs) in the car's computer (ECU) to understand the reason for the Check Engine light appearing. Engine Performance: Monitoring live data such as fuel combustion efficiency, sensors (oxygen sensor, air sensor), and piston pressure. Transmission (Gearbox): Checking the transmission computer to ensure smooth shifts and the absence of problems with internal sensors or transmission fluid temperature. 2. Electronic and Electrical Systems Check Smart and Advanced Systems: Checking safety systems such as the Anti-lock Braking System (ABS) and Airbag System (SRS). Comfort and Control: Checking the Body Control Module (BCM) responsible for screens, air conditioning, windows, and internal electrical systems. Battery and Alternator: Measuring battery efficiency and alternator (generator) voltage to ensure electrical stability.