Well the person above me is describing how to reset the maintence light not the check engine light and as far as taking your car to auto zone for a free check do not do that either Auto zone does have a dtc pad but it does not work with Hondas interactive network and is not designed just for Hondas it is just a generic pad that works on all vehicles Auto zone can reset the engine light but there pad cannot excactly tell you why the light is on. The only way to figure out excactly why the light is on is to take it to a Honda dealer they will charge you between 40 and 50 dollars for a diagnostics charge but there pad will open the ecm and send a signal to it to tell it excactly what is wrong and why the light is on