1. Attachments are working again! Check out this thread for more details and to report any other bugs.

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

    Joined:
    Dec 20, 2014
    23
    1
    0
    Location:
    Washington, DC
    Vehicle:
    2008 Prius
    Model:
    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

    Joined:
    Oct 25, 2020
    348
    151
    0
    Location:
    iowa
    Vehicle:
    2006 Prius
    Model:
    II
    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

    Joined:
    Dec 20, 2014
    23
    1
    0
    Location:
    Washington, DC
    Vehicle:
    2008 Prius
    Model:
    II
    What about an evap system leak?
     
    #3 Mattdr28, Sep 13, 2021
(You must log in or sign up to post here.)