Sienna AWD V6-3.3L (3MZ-FE) (2004)
cause of the DTC.
Refer to the Technical Information System (TIS), 2004 model year Sienna Repair Manual, for the applicable DTC (P0037, P0038, or P0136):
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Engine/Hybrid System - Engine Control - "SFI System: P0037, P0038, P0057, P0058 Oxygen Sensor Heater Control Circuit High"
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Engine/Hybrid System - Engine Control - "SFI System: P0136, P0156 Oxygen Sensor Circuit Malfunction"