How can I get the check engine light to go off on a 2000 Pontiac Sunfire?

[gitrdone281]

I can usually pull the codes and fix things myself but this problem takes the cake. When I hook it up to an OBD reader, there is no code. Now here's the real kicker: When the check engine light is on, my interior lights stop working. Once in a while, my interior lights will come on and the check engine light goes off. Not sure if I need a mechanic or a priest. Please help!