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Thread: code p0126 odb sensor question

  1. #1
    Registered Member
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    mazda protege 5 silver

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    code p0126 odb sensor question

    check engine light is on did the odb sensor gave me code P0126 -Insufficient Coolant Temperature for Stable Operation- anyone mechanic out there knows how I can fix this problem any info would help thank you

  2. #2
    Mother Nature's Race Fuel funktownp5's Avatar

    02 Mazda P5 Turbo

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    DTC P0126

    DTC P0128 Coolant thermostat stuck to open

    DETECTION

    CONDITION
    DTC P0126
    If ECT signal never exceeds 71C {160F} after engine start for specified period, PCM determines that the

    coolant thermostat is stuck open.

    MONITORING CONDITIONS
    IAT:
    Above -10C {14F}

    Difference between ECT at engine start and minimum IAT:
    Below 6C {43F}

    Vehicle speed
    over 9.5 km/h {5.9 mph}

    DTC P0128
    PCM monitors MAF, IAT, VSS and ECT signals and calculate radiator's heat radiation ratio while following

    monitoring conditions are met. If calculated value exceeds threshold, PCM determines that the coolant

    thermostat is stuck open.

    MONITORING CONDITIONS
    ECT at engine start:
    Below 35C {95F}

    IAT:
    Above -10C {14F}

    Difference between ECT at engine start and minimum IAT:
    Below 6C {43F}

    Vehicle speed
    above 25 km/h {15 mph} for ATX, 40 km/h {25 mph} for MTX

    Diagnostic support note
    This is a intermittent monitor (THERMOSTAT)

    MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles.

    DIAGNOSTIC MONITORING TEST RESULTS is available.

    PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.

    FREEZE FRAME DATA is available.

    DTC is stored in PCM memory.

    POSSIBLE

    CAUSE
    Coolant thermostat malfunction

    ECT sensor malfunction

    PCM malfunction


  3. #3
    Mother Nature's Race Fuel funktownp5's Avatar

    02 Mazda P5 Turbo

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    Looks like you themostat is stuck open and proly needs to be replaced, easy fix.

  4. #4
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    mazda protege 5 silver

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    I ain't no mechanic but does it mean just replace the thermostat then? the check engine light came on about 2days ago how long do I have to replace it and is it easy to replace? after replace will the check engine light go away and thanks for replying by the way

    Quote Originally Posted by funktownp5
    Looks like you themostat is stuck open and proly needs to be replaced, easy fix.

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