DTC P0037: Ho2S2 Heater Control Circuit Low - Bank 1, DTC P0038: Ho2S2 Heater Control Circuit High - Bank 1, DTC P0057: Ho2S2 Heater Control Circuit Low - Bank 2 Or DTC P0058: Ho2S2 Heater Control Circuit High - Bank 1: Description
WARNING: This page is about a different car, the 2002 Nissan Xterra and 2002 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
The ECM controls on/off operation of HO2S2 heaters based on engine speed. On 3.3L models, when engine speed is more than 3200 RPM, HO2S2 heaters are turned off. On 2.4L models, HO2S2 heaters are on when engine is running.