Reset service engine soon light 2003 cadillac deville?

To reset the "Service Engine Soon" light on a 2003 Cadillac DeVille, you can use an OBD-II scanner to clear the trouble codes after addressing the underlying issue. If you don’t have a scanner, you can disconnect the negative battery terminal for about 10-15 minutes, which may also reset the light. However, it's essential to ensure that any underlying problems are fixed before resetting the light to avoid potential damage or further issues. Always consult your vehicle's manual for specific instructions related to your model.