How do you reset the check engine light on a 2001 Honda Odyssey?

First, make sure you have the activation code for you radio. You can get this from your dealership. Once you have that in hand, disconnect the battery in your car for a couple of hours. Then reconnect it. It will reset the Check Engine Ligh (until it gets triggered again.) Once the battery is reconnected you'll realize your radio isn't working. This is a feature that is meant to deter a would be radio thief. Use the code your dealer gave you and re-activate the radio. The code is entered using the radio channel resets (i.e. 254136).