Engine diagnostics is the process of identifying and troubleshooting issues within a vehicle's engine. This involves using specialized tools and equipment to read data from the engine's control unit, which monitors various parameters such as temperature, pressure, and performance. By analyzing this data, technicians can pinpoint problems that may affect the engine's efficiency and reliability. Modern vehicles often come equipped with onboard diagnostic systems, commonly referred to as OBD-II. These systems provide error codes that help mechanics understand specific issues, such as faulty sensors or misfiring cylinders. Regular engine diagnostics can help maintain vehicle performance and prevent costly repairs in the future.