2008 Toyota Corolla Code P0420: Catalytic Converter Performance Below Threshold?

Model: Getz Fault Code: P0420 Posted: 2016-03-02 14:12

My 2008 Toyota Corolla has triggered a P0420 diagnostic code, indicating catalytic converter performance is below the minimum threshold. According to the sensor specifications, under normal conditions, Sensor 1 should read between 0.2 and 0.8 volts, with a reading approaching 0.95 volts being expected. I'm wondering whether a leak in or around the catalytic converter could be causing this abnormal voltage reading, or if the sensor itself might be faulty.