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Oxygen Sensor Replacing & CAT Shield

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Timexhiker, Apr 12, 2023.

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  1. Timexhiker

    Timexhiker Junior Member

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    I have a CAT shield on my 2005. Engine light on. Auto store told me it’s 02 Sensor going bad. Will CAT shield have to be removed to replace Sensor. Could any Auto Repair shop be able to do that? I live where no DEQ inspections are required. Small rural town with 2 Auto Repair Shops. Haven’t asked around yet.
     
    #1 Timexhiker, Apr 12, 2023
  2. SFO

    SFO Senior Member

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    Please post the OBD2 code(s) that they found.
    O2 sensors don't last forever, how many miles are on the current sensors or when were they last replaced?

    Never worked around a cat shield, but would assume that it needs removal to access either the upstream or downstream sensor.
     
    #2 SFO, Apr 12, 2023
  3. Timexhiker

    Timexhiker Junior Member

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    Original as far as I know @ 158K
     
    #3 Timexhiker, Apr 12, 2023
  4. PriusCamper

    PriusCamper Senior Member

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    You or they will use a pry bar to pop the rivets and unscrew the bolts to remove shield to deal with O2 sensor... It doesn't take much effort if your pry bar is long enough.
     
    #4 PriusCamper, Apr 12, 2023
  5. SFO

    SFO Senior Member

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    Getting up there, so quite possible. What were the OBD2 codes?
     
    #5 SFO, Apr 14, 2023
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