Vehicle diagnostics refers to the process of identifying and troubleshooting issues within a vehicle's systems. This typically involves using specialized tools and software to read error codes generated by the vehicle's onboard computer. These codes can indicate problems with various components, such as the engine, transmission, or braking system. By performing diagnostics, mechanics can pinpoint the source of a problem more accurately, leading to more efficient repairs. Regular diagnostics can also help maintain vehicle performance and safety, ensuring that issues are addressed before they become more serious and costly.