DTC P0037-Heated oxygen sensor 2 heater control circuit low
DTC P0038-Heated oxygen sensor 2 heater control circuit high
The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed, amount of intake air and engine coolant temperature.
The current amperage in the heated oxygen sensor 2 heater circuit is out of the normal range. (An excessively low voltage signal is sent to ECM through the heated oxygen sensor 2 heater.)