some maintenence light went on 3 weeks after a oil change it been over a month now any ideas car runs normal

 

it goes off usually every 7500 miles when you got to turn your ignition on there is a switch under the dash just to the right of the column and that will reset it

 

turn ignition 2 clicks ( one right before cranking) and reach under the dash, or look under the dash, up under it there is a small black box with a square green button, if you hold it for 3-5 seconds the light should go off. It was my luck that the light came on about 20 miles after i bought my integra, it freaked me out, ha ha.