There should be a grey service connector, looks like an open plug. Just put a paper clip in there to jump across the wirse, and your chekc engine light with flash a code. Long flash is the 10's place, short flash is the 1's place. So a long, long, short, short, short. Would be 23. Knock sensor.

You can look up what these codes mean online (check the Honda FAQ sticky in this forum) or you can buy the helms manual and get to know everything about your car. www.helminc.com