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Another low milage thread

Discussion in 'Gen 2 Prius Technical Discussion' started by dpower, Mar 19, 2019.

  1. dpower

    dpower Member

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    For almost the last year my 2005 Prius has been getting low 30 mpg.
    I went through the usual list of tires, filters, binding breaks the usual. It was logging some misfires caused by a leaking manifold old gasket, but not a lot. No codes logged. I went ahead and replaced the injectors and after cleaning the MAF I replaced it. Hand a compression test dome,138 psi well above the 99 min Toyota specs. Took the step and replaced the traction batter. Car was now running like a dream. But still 33 mpg. Pondering the system I finely replaced the fuel/sensor that read good but did have 179,000 miles on it and it’s a bitch to get to, I had heard that these get lasy over time.
    That took care of it back to 45-48 mpg. I think this should be added to the lists as it doesn’t code.
     
    #1 dpower, Mar 19, 2019
    SFO, Skibob and bisco like this.
  2. edthefox5

    edthefox5 Senior Member

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    I would think that if that sensor was bad it would throw a code. Emissions are highly monitored.
     
    #2 edthefox5, Mar 19, 2019
  3. padroo

    padroo Senior Member

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    What fuel/sensor do you mean?
     
    #3 padroo, Mar 19, 2019
    edthefox5 and maddog2020 like this.
  4. Skibob

    Skibob Senior Member

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    Probably what a lot of people think of as the upstream O2 sensor.
     
    #4 Skibob, Mar 19, 2019
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  5. padroo

    padroo Senior Member

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    Some problems can't be solved without scan data.
     
    #5 padroo, Mar 19, 2019
  6. gptoyz

    gptoyz Junior Member

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    +1


    iPhone ?
     
    #6 gptoyz, Mar 21, 2019
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