is it when its warmed up? or when its cold? Does it still have the keypad system, it may be an alarm issue also. Don't discount the possibility of it being the air flow meter, but the later ones are more reliable then GC8 meters, unless, the filter hasn't been maintained. I may be wrong, but the Apexi ones are not oiled anyway. Oiled filters are safe with Subaru AFM's, as long as they are oiled properly (not over-oiled). Remember, the factory filters are oiled paper. It may also be an air leak, check hose clamps and lines.

BTW, I've been running a K&N pod on my bugeye for 3 years, no issues

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i