P1133 is bank 1 sensor 1 that is the front.
All the reading I have done on this code says to just change out the front 02 sensor.
P0137 is bank 1 sensor 2 that is the rear.
A code P0137 may mean that one or more of the following has happened: Faulty o2 sensor Exhaust leak near the rear sensor Plugged catalyst Short to voltage on O2 signal circuit High resistance or open on O2 signal circuit Engine running very rich or lean Engine misfire condition Fuel pressure very high or low - fuel pump or pressure regulator