I have a 2002 Saab 93 with ~135300 miles. Recently my oil light has flashed on and off and now my oil pressure warning light is also coming on intermittently while driving. This happens mainly on city streets. I do have an oil leak from the crank shaft seal, so i carry around a jug of oil for emergencies. I check my oil frequently, and it is full. Could there be a problem with the oil pressure sensor (already replaced once), or oil filter? Any and all help is greatly appreciated.