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P0304 2010 165k miles...

Discussion in 'Gen 3 Prius Main Forum' started by MikeV, Jan 15, 2021.

  1. MikeV

    MikeV Junior Member

    Joined:
    Nov 22, 2020
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    Location:
    philadelphia
    Vehicle:
    2010 Prius
    Model:
    Three
    I got a p0304 code about a week ago. I've been experienceing mpg' dropping from around 45 to 40 each fill since Aug. I verified the code three times at different locations and the last place I took it they reset it for me the other two refused. So for the last week I havent gotten the code again yet. Overall except for the MPG drop I really havent experienced rough driving. I am wondering since before the code a week ago I did not have any of the modes set so I wanted to hit the econo mode and mistakenly hit the power mode. I changed it back within seconds and wasnt more than 10 miles that the code triggered. Car has 165K original spark plugs
     
    #1 MikeV, Jan 15, 2021
  2. Josey

    Josey Active Member

    Joined:
    Jun 10, 2019
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    Location:
    Virginia
    Vehicle:
    2003 Prius
    Model:
    One
    It seems that you're posting about a 2010, and this is a Gen 1 area ('01-03). So you might want to find the right forum.

    But I can just say - egads man. 165K on the original plugs? Change those things.
     
    #2 Josey, Jan 15, 2021
    WHCSC likes this.
  3. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
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    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    Those are changed every 120,000 miles. If not, it can lead to other long term issues.
     
    #3 Grit, Jan 15, 2021
    Last edited: Jan 15, 2021
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