Ford P1129 OBD-II Trouble Code Definition:
P1129 Downstream Oxygen Sensors Swapped from Bank to Bank
P1129 Ford OBD-II Trouble CodeDescription:
Downstream Oxygen Sensors Swapped from Bank to Bank is one of the definitions for the P1129; however your vehicle’s manufacturer may have a different definition for the P1129 code. Please check below for your specific make.