Check Engine Light On and Accidentally Erased Codes

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Mattdr28, Sep 13, 2021.

  1. Mattdr28

    Mattdr28 Junior Member

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    Vehicle:
    2008 Prius
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    II
    My check engine light came on suddenly the other day. I just had a 145,000 mi service about a month ago. I plugged in my OBD scanner and accidentally pressed the reset code button on the Dr. Prius app before I was able to get the codes. I ran the emissions test using the Car Scanner ELM app and it says the O2 sensor failed the test. Does this mean the O2 sensor needs replacing? Should I run another 50-100 miles to see if the check engine light comes on again?
     
    #1 Mattdr28, Sep 13, 2021
  2. nancytheprius

    nancytheprius Active Member

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    if nothing feels or sounds wrong when running/driving, I wouldn’t replace the oxygen sensor until you get the original codes that were cleared. I’d recommend driving some more until the light comes back
     
    #2 nancytheprius, Sep 13, 2021
  3. Mattdr28

    Mattdr28 Junior Member

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    Location:
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    2008 Prius
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    II
    What about an evap system leak?
     
    #3 Mattdr28, Sep 13, 2021
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