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Home >> Toyota >> 2003 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Control System Self-Diagnostics) >> Diagnostic Tests >> DTC P0135: Heated Oxygen Sensor No. 1 Heater Circuit >> Circuit Description

Circuit Description

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

Heated oxygen sensor No. 1 monitors exhaust gas oxygen content and delivers input signals to ECM. Heated oxygen sensor No. 1 is located on exhaust pipe in front of catalytic converter and may also be referred to as bank No. 1 sensor No. 1, or front oxygen sensor. ECM uses input signals to determine fuel injection system operation. DTC is set when heated oxygen No. 1 heater current draw exceeds 2 amps or is .2 amp or less when heater operates. If DTC P0135 exists, ECM will operate in fail-safe mode which turns off the heater for heated oxygen sensor No. 1. Possible causes are:

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