I'm replacing the steering rack and had to disconnect both downstream O2 sensors beforehand. Now I can't tell which sensor goes to which connector. They are both the same. Yea I got a 50 50 chance, but I'd like to get it right while they are more accessible with the subframe lowered. Can I leave one disconnected and use a scan tool to show which bank is disconnected and go from there? And if so, what is bank 1 and bank 2? Radiator or firewall side?