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Post Cat Oxygen Sensor

Discussion in 'Gen 2 Prius Main Forum' started by jont, Nov 12, 2012.

  1. jont

    jont Junior Member

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    Vehicle:
    2004 Prius
    Engine light lit up. Checked code. Oxygen sensor defective. Replaced sensor with aftermarket part. Can't get engine light to go out (using diagnostic reader). Dealer wants $400 to turn it off. Can it be turned off without the dealer? Any help appreciated. Thx
     
    #1 jont, Nov 12, 2012
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Green Valley, AZ
    Vehicle:
    2015 Prius
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    Two
    Disconnect the 12V battery negative cable for a few minutes, then reconnect.

    If you still see the check engine light then there is still something wrong.

    The sensor upstream from the catalytic converter is an air/fuel ratio sensor while the downstream sensor is an oxygen sensor. Did you replace the downstream sensor?
     
    #2 Patrick Wong, Nov 12, 2012
  3. jont

    jont Junior Member

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    2004 Prius
    The error code indicated the problem was the post catalytic sensor...so I replaced it...I'll try detaching the negative cable and see if that solves the problem...thx
     
    #3 jont, Nov 13, 2012
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