Reset 2004 toyata sienna check engine light?

To reset the check engine light on a 2004 Toyota Sienna, you can disconnect the negative battery terminal for about 15 minutes. This will clear the engine codes and reset the light. Alternatively, you can use an OBD-II scanner to erase the codes directly from the car's computer. However, if the underlying issue causing the check engine light is not resolved, the light may come back on.