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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 115 (Engine Control System Self Diagnostics - 4-Cylinder) >> Diagnostic Tests >> DTC P0037: Oxygen Sensor Heater Control Circuit Low (Bank No. 1 Sensor No. 2) & DTC P0038: Oxygen Sensor Heater Control Circuit High (Bank No. 1 Sensor No. 2) >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Sensor No. 2 refers to the farthest sensor from the engine body.

For circuit description, see DTC P0136: OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK NO. 1 SENSOR NO. 2) . Detecting condition of DTC P0037 is when the heater operates, heater current is 0.25 A or less. Detecting condition of DTC P0038 is when heater operates, heater current exceeds 2.4 A.

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