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Thread: Rough Idle, p0126, p2402 Help!

  1. #1
    Registered Member

    2007 Mazda 3, 5 dr GT

    Join Date
    Nov 2011
    Location
    Houston
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    2

    Rough Idle, p0126, p2402 Help!

    Hi, I am new to the forum. Thanks in advance for any advice you may have!


    I have a 2007 Mazda 3 2.3L 5 dr. It has recently started to idle roughly and occasionally comes close to stalling while in park. I scanned for codes and came up with P0126 (Thermostat?) and P2402 (EVAP Leak detection Pump?) Both are problems I need to address but could they be the cause of the rough idle or is it something else?

  2. #2
    Registered Member

    2008 Mazda 3i 4 dr Touring Value Edition

    Join Date
    Jul 2008
    Location
    Asheboro, NC
    Posts
    599
    Yes, the codes can cause a poor idle. Get those problems corrected and your idle will probably improve.
    The thermostat code indicates coolant thermostat is stuck open. That would affect engine warn up,
    in cold weather it may never warm up. I would check the thermostat first. The code P0207 could be
    caused by a vacuum in the hoses for the evaporative emission system.

    Clifton

  3. #3
    Registered Member

    2005 mazda 3 hatch

    Join Date
    Nov 2011
    Location
    United States
    Posts
    18
    For the first code if you want to check your thermostat pull it out and put it in boiling water. If it doesn't open then you know its no good. If you have a vac leak try spraying your intake hoses with start fluid . If you rpms rev higher then you know you have a vac leak..

  4. #4
    Registered Member

    MS3

    Join Date
    Nov 2018
    Location
    California
    Posts
    7
    Stock or not? Po126 I just had it was thermostat. Then I had a vacuum leak and it was throwing po2187 and I had a bad bpv hose and vacuum hose T since I'm full recirc. Fixed and coded haven't returned.

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