When you had to exrend the connection for the O2's did you cut the harness or cut the sensor itself? Some one told me thatit does make a difference. I cut the sensor and then crimped exensions in. My gas mileage still sucks I ran some codes the other day and it said that both o2's were lean but I am burning rich? Today I ran my codes and no problems so I dont know what is going on I am still getting pispoor gas milege.