P0171 and P014C codes popped up on 2012 Prius 210K miles

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by 2GenPrius, Sep 22, 2024.

  1. 2GenPrius

    2GenPrius Member

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    Hi all,

    2012 Toyota Prius Four
    210K miles
    Headgasket already repaired, HV battery upgraded newer OEM modules, ABS Brake Acutator Fixed so not any of those.

    I've noticed my exhaust smells like gas, and these codes just popped out. Its frustrating because I just replaced the HV battery, yet I don't think that did anything.

    I was reading that the P0171 code is likely fuel injector or pump related, while the P014C is likely the 02 sensor crapping out.

    I noticed on Torque Pro that the Emissions Ready status and Current Drive Cycle status that only the Evap system is incomplete after driving around 80 miles.
     
    #1 2GenPrius, Sep 22, 2024
  2. MAX2

    MAX2 Active Member

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    Electronics tries to adjust the parameters of the mixture, which is formed incorrectly, and reaches the regulation limit.
    1. The signal is false, look for the cause of the false signal (oxygen sensor, engine control unit)
    2. The signal is correct, look for the reason for the mixture deviation from normal values (everything that is responsible for the supply and regulation of fuel and air)
     
    #2 MAX2, Sep 23, 2024
  3. 2GenPrius

    2GenPrius Member

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    Then why is the evap not ready?
     
    #3 2GenPrius, Sep 23, 2024
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