Here's how it works:
* Sensors: Your car has various sensors monitoring engine performance, like oxygen sensors, fuel pressure sensors, and others.
* OBD-II Computer: This computer receives data from these sensors and analyzes it.
* Engine Light: If the computer detects a problem or a value outside of its pre-programmed parameters, the engine light will illuminate.
To diagnose the reason for the engine light:
1. OBD-II Scanner: You'll need a scan tool, also known as an OBD-II scanner, to communicate with the car's computer. These are widely available and can be purchased online or at automotive stores.
2. Read Codes: The scanner will read diagnostic trouble codes (DTCs) stored by the computer. These codes provide a specific indication of the problem.
3. Interpretation: You'll need to research the DTCs to understand the potential issue. Many online resources and repair manuals can help you interpret the codes.
4. Troubleshooting: Based on the DTCs, you can begin to troubleshoot the problem. This may involve inspecting parts, testing sensors, or replacing faulty components.
Important Note: Some automotive stores offer free engine light checks. However, it's always a good idea to have a qualified mechanic diagnose the problem if you're unsure about how to proceed.
