Can anybody help me? I have a 02 Focus 1.6 zetec and occasionaly the engine warning light flickers on. I have managed to get the fault code off the diagnostics which is 9318, so I looked up the meaning which says "battery voltage low". I have since checked my battery on a dvm (12.5v) and with a drop tester (holds charge no problem). So I am a bit baffled! does anybody know if there is another meaning for fault code 9318? because surely if the battery voltage was low then the red battery warning light would come. Although the battery theory kind of adds up because I have only ever had this light come on in early the morning usually on a monday, (i.e. when the car has just been left standing for a long period of time) and it will go off if I give the engine some rev's. Any help, advice or explanations would be greatly appreciated.