DTC P0037: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2) Or DTC P0038: Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2): Notes

WARNING: This page is about a different car, the 2003 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction.