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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Engine Control System Self-Diagnostics) >> Diagnostic Tests >> DTC P0141: Heated Oxygen Sensor Heater Circuit (Bank No. 1 Sensor No. 2) >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

Heated oxygen sensor monitors exhaust gas oxygen content and delivers input signals to ECM. Heated oxygen sensor (bank No. 1 sensor No. 2) is located on exhaust pipe behind catalytic converter. ECM uses input signals to determine fuel injection system operation. DTC is set when heated oxygen sensor (bank No. 1 sensor No. 2) heater current draw exceeds 2.35 amps or is .2 amp or less when heater operates. If DTC P0141 exists, ECM will operate in fail-safe mode and turn off the heater on heated oxygen sensor. Possible causes are:

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