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Thread: Need Help

  1. #1
    Noob
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    Default Need Help

    Hey Guys,

    I'm new to the forum world but need some help. I currently have a 2010 Mazda 3GT 2.5 and got a check engine light. Long story short its the P0138 - O2 Sensor Circuit High Voltage Bank 1 Sensor 2. Does anyone know where the sensor is actually located? Do I need to change the other sensor ? ( I know there are two)

    Thanks!

  2. #2
    Uncle Ben
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    Default Re: Need Help

    Super fast to sign up to a forum and ask
    Same info on quick google search
    how to fix p0138
    how to video

    Be careful with 02 sensors, sometimes they won’t want to move and you will need torches to heat the bung. Worst case scenario, they strip out the bung and you either need to replace the down pipe or if you are lucky... someone can repair the threads and or put in a tap.
    And no, you do not need to replace both at the same time
    1991 Nissan Pathfinder - trade in, 2005 Mazda 3 GX ty grey - Write off, 2010 Mazda 3 GT E sedan CWP- trade in, 2010 Speed 3 w/tech CWP - Up for sale (soon), 2007 Mazda 3 GS silver- motor swapped in to 2009 MS3 CWP that had blown engine, 2002 BMW 330ci silver- new winter ride, 2005 BMW M3- new toy

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