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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0135: Oxygen (A/F) Sensor Heater Circuit (Bank 1 Sensor 1) & DTC P0155: Oxygen (A/F) Sensor Heater Circuit (Bank 2 Sensor 1) >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

DTC is detected when heater operates and heater current exceeds 19.7 amps or heater current is 3 amps or less when heater operates This is caused by an open or short in A/F sensors circuit (bank 1, 2 sensor 1), A/F sensors (bank 1, 2 sensor 1) heater or ECM.

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