Yeah that's what I did after replacing the ocv. .. i took out the battery terminal which is negative ofcourse ... but still the problem persists and I just have a question that Steve guided me to take out the EFI now my question is that if taking out efi is different to plugging off the negative battery terminal ... then do I have to plug the battery off and take out the efi or with the battery terminals attached ? Or taking out the efi is as same as taking out the battery terminal ? And I will see to the screen filter also .. i dnt knw much about it thought ... does it come with the ocv or I have to replace it aswell individually ?