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Thread: Check Engine Light (P0138)

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    Default Check Engine Light (P0138)

    Hey Everyone,

    Similar to my luck in life my 2008 Mazda 3 GT is a month away from a emissions test and it threw up a CEL P1038. We barely drive the Mazda and the last time we drove it was 2 weeks ago. My wife took it out for a short trip and the CEL came on. She came home and told me about it so I took it for a drive (15km) or so and the CEL was still on. Turned the car off and back on and the CEL is now gone (3 drives later).

    Today I borrowed my brother ODBC and it came up red with a P0138 (Pending). Just wondering why the CEL light went away and what could the issue be? The CEL is still off.

    Thanks T

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    Default Re: Check Engine Light (P0138)

    The O2 sensor could be getting a bit flaky. My recommendation to you would be to give the car an Italian tune-up since you don't use it too frequently. Wipe all the codes and take it in immediately for your E-test.

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    Default Re: Check Engine Light (P0138)

    Quote Originally Posted by morganc View Post
    The O2 sensor could be getting a bit flaky. My recommendation to you would be to give the car an Italian tune-up since you don't use it too frequently. Wipe all the codes and take it in immediately for your E-test.
    How do I wipe the code? My ODBC only reads them

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    Default Re: Check Engine Light (P0138)

    Quote Originally Posted by morganc View Post
    The O2 sensor could be getting a bit flaky. My recommendation to you would be to give the car an Italian tune-up since you don't use it too frequently. Wipe all the codes and take it in immediately for your E-test.
    Never immediately after wiping codes. You have to go through an entire cycle until your car will read "ready."

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    Default Re: Check Engine Light (P0138)

    Or you can replace the O2 sensor at a trusted independent mechanic. Seems to be going.
    Or buy your own obd2 scanner for $50 and wipe the code on your own.
    Personally I’d get it fixed.


    Sent from my iPhone using Tapatalk

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    Default Re: Check Engine Light (P0138)

    Quote Originally Posted by Jackal View Post
    Or you can replace the O2 sensor at a trusted independent mechanic. Seems to be going.
    Or buy your own obd2 scanner for $50 and wipe the code on your own.
    Personally I’d get it fixed.


    Sent from my iPhone using Tapatalk
    Picked up the part from Mazda and heading to Jimmy on Friday to get it swapped out. Hoping I don't swap it out and it does not get better.

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