How do you reset check engine light on a scion?

To reset the check engine light on a Scion, you can use an OBD-II scanner to clear the trouble codes stored in the vehicle's computer. Alternatively, you can disconnect the negative battery terminal for about 15 minutes, then reconnect it. This method may reset the light, but if the underlying issue isn't resolved, the light will likely come back on. Always ensure that any mechanical problems are addressed before resetting the light.