so i pulled two codes yesterday. on being P1132 and the other being P1151. 1132 means driver side o2 is reading rich and the 1151 means that the passenger side is getting a lean reading. Both of these o2 sensors are brand new. this just started about 3-4 weeks after i did my head swap which included longtubes. could it be related to the o2 extensions? why am i getting conflicting readings?