DID YOU PUT EXTRA OIL ON THE FILTER OR WAS THERE EXCESS ON THE FILTER?
K&N OIL EATS UP MASS AIR FLOW SENSORS. OIL COATS THE SENSOR THAT READS THE AIR FLOW GOING THROUGH THE SENSOR AND DOESN'T READ CORRECTLY, SO THE LITE COMES ON. AFTER TIME THE OIL BUILDS UP ON THE SENSOR AND WRECKING IT...