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2007 Toyota Prius P0420 @146K

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by yruvim, Aug 11, 2017.

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  1. yruvim

    yruvim Junior Member

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    Vehicle:
    2007 Prius
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    Two
    Hello, so I have a 2007 Prius with 146K on it and I started getting the P0420 code. I scanned it and it shows "Catalyst System Efficiency Bellow Threshold (Bank 1)" I have been resetting the code and after about 300 miles it keeps coming on again. Is it safe to say that my Air/Fuel Ratio/O2 sensor is bad? Also if anyone has the OEM part number for both the upstream and downstream sensors that would be appreciated.
     
    #1 yruvim, Aug 11, 2017
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    #2 Patrick Wong, Aug 11, 2017
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  3. Travis Decker

    Travis Decker Active Member

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    Cat! Replacing AF sensors a waste of time....
     
    #3 Travis Decker, Aug 11, 2017
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  4. JC91006

    JC91006 Senior Member

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    California has a 10 year warranty, hopefully you bought your car after today's date 10 years ago
     
    #4 JC91006, Aug 11, 2017
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  5. wjtracy

    wjtracy Senior Member

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    #5 wjtracy, Aug 11, 2017
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