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Home >> Toyota >> 2004 >> Avalon XLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Diagnostics >> DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) >> Monitor Description

Monitor Description

The ECM monitors the rear heated oxygen sensor (HO2S) in the following 2 items:

  1. The HO2S voltage changes between Rich (more than 0.45 volts) and Lean (less than 0.45 volts) while the vehicle is running (repeating acceleration and deceleration). If not, the ECM interprets this as a malfunction, illuminates the MIL, and then sets DTC.
  2. The HO2S voltage does not remain at less than 0.05 volts for a long time while the vehicle is running. If it does, the ECM interprets this as a malfunction, illuminates the MIL, and then sets DTC.
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