1. Check Engine Light:
- Indicates a problem with the vehicle's emission control system or engine.
- Is usually illuminated by the vehicle's computer (ECU) when it detects a problem or a fault in the engine or emissions-related components.
- Typically requires immediate attention as it could indicate a potential issue that affects the vehicle's performance, emissions, or drivability.
- May come on accompanied by a diagnostic trouble code (DTC) that can be read using a diagnostic tool or scanner.
2. Service Soon Light:
- Is generally used as a maintenance reminder or alert.
- Informs the driver that the vehicle is due for a routine maintenance service, such as an oil change, tire rotation, or fluid level check.
- Does not usually indicate an immediate problem or a fault with the vehicle's operation or performance.
- Is primarily used as a reminder to stay up-to-date with the vehicle's scheduled maintenance to keep it in good condition.
It's important to note that the specific definitions and functions of these lights can vary across different vehicle manufacturers, so it's always best to refer to the vehicle's owner's manual or consult with a qualified mechanic or service professional to accurately interpret the meaning of these lights and take appropriate action.