Check engine light adn ROOM fuse

Hi.  The check engine light on my 2000 Protege ES recently went on.  I checked all the fuses and none were blown.  When I turned back on the car the engine light was off.  Anyone know where the ROOM fuse is -- it wasn't listed in manual and I may have missed it.  Concerned cause now after driving the car 30 miles the check engine light is back on.  Thanks.