Bank 1 would be the bank of cylinders that contains the number 1 cylinder.Sensor 1 would be the sensor placed before the catalytic converter (AKA the upstream sensor).
P0157 02 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
Trouble code P0137 means:O2 sensor circuit low voltage (Bank 1 Sensor 2)
O2 sensor circuit high voltage (bank 1 sensor 2)
Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
Sensor 2 is after the catalytic converter.
O2 sensor circuit low voltage (bank 2 sensor 1)
Trouble code P0137 means:O2 sensor circuit low voltage (Bank 1 Sensor 2)
Trouble code P0131 means:O2 sensor circuit low voltage (Bank 1 Sensor 1)
Trouble code P0132 means:O2 sensor circuit high voltage (Bank 1 Sensor 1)
Trouble code P0132 means:O2 sensor circuit high voltage (Bank 1 Sensor 1)
Trouble code P0131 means:O2 sensor circuit low voltage (Bank 1 Sensor 1)
Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1)symptomsOther than the MIL light illuminating you may not notice any performance issues.causeA short in the O2 sensor heater circuit or the sensor itselfA faulty O2 sensor heaterWiring or connectors are broken or frayed to the sensor or relayBad PCM or ECMThe fixCorrect wiring short or loose connector found in inspection.and/orReplace the bank 1 sensor 2, O2 sensor