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    Toyota Corolla 2004 1.4 vvti Archived Message

    Posted by Owen O Driscoll on June 30, 2008, 10:57 pm

    CAT efficiency
    MIL Light on with code P0420 CAT efficiency below threshold B1. Auto Data description of code Catalytic converter, wiring,HO2 sensor 2 .
    This car has good gas readings as follows high idle CO OOO HC OO7 CO2 15.37 O2 O.O7 Lambda 1.OO
    Low idle readings CO O.O3 HC OO8 CO2 15.51 O2 O.O5. I have activity on sensor 1 of O.1- O.6 volts and I also have activity on sensor 2 of O.1-O.4 . Do I bite the bullet and fit CAT or is there another issue that I am not seeing or is there a soft wear update for this problem .
    I cannot see a wiring fault with sensor 2 and sensor activity is from scan tool not scope .

    Regards Owen

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