DTC P0031, DTC P0032, DTC P0051 & DTC P0052: Notes

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

Code Definition

DTC P0031: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1)
DTC P0032: Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 1)
DTC P0051: Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 1)
DTC P0052: Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 1)

NOTE: If DTCs related to MAF, IAT, TPS, ECT, HO2S and/or A/F sensor are output simultaneously, the E2 sensor ground circuit at ECM 34-pin connector E4 terminal No. 28 (Brown wire) may be open. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. For ECM connector terminal identification, see Figure.