P0031= Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1
P0037= Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2
Check the fuses and check the wiring harness that leads to the sensors. These codes can be caused by power failure to the heater circuit or an open circuit to ground.
Both of those share the same ground wire and are spliced partway up the harness before they reach connector C111. Check for continuity between the grounds of the sensors and the chassis. No ground = broken wire or bad connector.
Got the Versa figured out yet?
Monday, March 20th, 2017 AT 7:30 PM