Maintenance Req Light // O2 Sensor, Catalyst Monitoring, Evaporative System Warnings

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by PtotheRius, Sep 27, 2019.

  1. PtotheRius

    PtotheRius Junior Member

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    2007 Prius. 77K miles. Maintenance required light popped up so I plugged in my scanner and pulled up DashCmd, saw warnings for: Catalyst Monitoring, Evaporative System, and Oxygen Sensor (see attached image). Car is well maintained. New OEM battery installed in last year. Just had oil and air filters changed. Wondering if I should just change the O2 sensors at a local shop or take it into the dealer for diagnosis. Any thoughts?
     

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  2. Dxta

    Dxta Senior Member

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    Those results does not make any sense. Get a hybrid compatible code reader to retried actual codes. Except if you have some quick cash to throw at parts.
     
  3. TMR-JWAP

    TMR-JWAP Senior Member

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    @PtotheRius

    The Gen 2 maintenance warning light serves one purpose only. To let you know an oil change is due.
    At ~4500 miles, it will blink a few times when you start the car.
    At ~5000 miles, it turns solid.
    That's all. Nothing else. If it's on now, all that means is you had the oil changed early. Just go ahead and reset the warning light so it works for next time.

    There's a ton of videos on how to reset it. Basically you make sure your odometer is on the odometer function (not trip meter), turn the car off, hold the trip reset button while starting the car back up again. I may be off a bit, so it would be best to review a youtube video or something similar.

    Your other codes may be invalid if your reader is not Prius friendly.
     
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  4. PtotheRius

    PtotheRius Junior Member

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    Great! I reset the maintenance light and got the EngineLink software for iphone. It shows only an Evaporative System incomplete warning (see attached). Not sure what this means. There are no other lights on dash and car runs well, getting ~47mpg. Perhaps I should just keep driving it around and see if it resets? Thanks for your replies!



     

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