How do you get the service engine soon light off?

To turn off the "Service Engine Soon" light, first, diagnose the underlying issue using an OBD-II scanner, which can identify error codes. Once the problem is resolved—whether it's a loose gas cap, faulty sensor, or other issues—reset the light by clearing the codes with the scanner or disconnecting the battery for a few minutes. If the light persists after repairs, it may indicate a more serious issue that requires professional attention. Always consult your vehicle's manual for specific guidance.