P0031-O2 Sensor 1/1 Heater Circuit Low, P0037-O2 Sensor 1/2 Heater Circuit Low: Notes
WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW.