Question about 2004 GMC Envoy

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2003 toyota corolla please help me with this code po125

I change THERMOSTAT AND ENGINE COOLANT TEMPERATURE SENSOR AND 02 HTR SENSOR AND 02 OXYGEN SENSOR AND SPARK PLUG AND LID FROM THE COOLANT AND REPLACE THE FUEL LID. I RESET THE CODE PO125 AND STILL CAME BACK THE SAME CODE PO125, I GIVE UP PLEASE HELP!.. THANK YOU AND GOD BLESS YOU ALL.

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  • GMC Master
  • 6,826 Answers

Did you bleed the coolant system?This needs to be done,and it should be fine,but you will have to have the code erased too.

Posted on Jul 06, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    If this was at all helpful,please rate,and thank you.

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How to replace a ect sensor on a 02 5.4 v8 triton


I hope you realize that the po125 DTC code does not necessarily mean that you have a problem with the cylinder head temperature [CHT] sensor or the Engine Coolant Temperature [ECT] sensor.

It only means that the coolant temperature is too low for closed loop operation.

Other issues that may trip a DTC po125,
  • Insufficient warm up time
  • Low engine coolant level
  • Leaking or stuck open thermostat
I would clear the code and see if it comes back- since you won't experience any difference in engine operation anyway.

You'll need to perform a continuity test on the sensor, when the engine is cool and then again after warming up the engine.

Then you'll want to take voltage readings on the wire harness that goes from the ECT back to the GEM.
You may find that the wire harness from the sensor to the GEM may be shorting out.

However, I would think that, if anything, the thermostat would be the culprit and malfunction before a faulty sensor.

You'll find the sensor under the upper radiator hose where the thermostat housing is mounted on the engine block. It may be obscured by the alternator.

And if you don't mind my 2 cents worth of friendly advice, either purchase a Chilton or Haynes repair manual from your local auto parts store or online.

Good luck on your project.

Dec 08, 2013 | Ford F-150 Cars & Trucks

1 Answer

Corolla, 1999, P0125


P0125 TOYOTA - Insufficient Coolant Temperature for Closed Loop Fuel Control

Possible causes- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection

Oct 14, 2012 | 2001 Toyota Corolla

1 Answer

Why the codes po125 & po135 &po155 keep coming back?


Hi there:

DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control

The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty ECT sensor, or a low coolant level).


DTC P0135 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
or
DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

A code P0135 and P0155 may mean that one or more of the following has happened:

  • O2 Heater element resistance is high
  • Internal short or open in the heater element
  • O2 heater circuit wiring high resistance
  • open or short to ground in the wiring harness

In order to solve just...
  • Repair short or open or high resistance in wiring harness or harness connectors
  • Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)


  • Hopoe this helps.

    Aug 28, 2012 | 1999 Toyota Sienna

    1 Answer

    '01 Sequoia throwing 2 OBD II codes: po125 & po135. replace pre-cat o2 sensor?


    DTC P0125 OBD-II - Insufficient Coolant Temperature For Closed Loop Fuel Control
    This means that the engine coolant temperature (ECT) sensor indicates that the engine has not reached the required temperature level to enter closed-loop operation within a specified amount of time after starting the engine. You will likely not notice any drivability problems.

    A code P0125 may mean that one or more of the following has happened:
    Insufficient warm up time
    Low engine coolant level
    Leaking or stuck open thermostat
    Faulty coolant temperature sensor


    DTC P0135 OBD-II - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
    This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135. You will likely notice poor fuel economy the illumination of the MIL.

    A code P0135 may mean that one or more of the following has happened:
    O2 Heater element resistance is high
    Internal short or open in the heater element
    O2 heater circuit wiring high resistance
    open or short to ground in the wiring harness


    For additional details, feel free to contact us in the preivous code link.

    Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

    Thank you for using Fixya, and have a nice day.

    Oct 12, 2011 | 2001 Toyota Sequoia

    3 Answers

    Readings on my 2003 Toyota 4 cylinder ck engine soon is P0128, P0420, P0430.. what could it be. Should I change thermostat, 02 sensor or catalytic converter.. Please advise.


    PO128 = It is probably a bad ECT (engine coolant temp) sensor. PO420= The problem could be a bad cat, o2 sensor (Pre- and/or post cat)or o2 sensor wires, or an air fuel mixture problem that has caused the cat to fail.PO430= Catalyst System Efficiency Below Threshold (Bank 2) Your CAT converter is not cleaning properly. Hope this helps, James Booth

    May 17, 2011 | Toyota Highlander Cars & Trucks

    2 Answers

    Engine light code p171 comes up. I recently changed the air flow sensor. Everything else is working fine. What can this be in a Toyota Corolla 2003?


    DTC P0171 is set when fuel trim is driven rich beyond a certain value. Possible causes are:
    1. Exhaust system leak.
    2. Improper fuel pressure.
    3. Fuel injector restricted.
    4. Defective heated oxygen sensor No. 1.
    5. Defective Manifold Absolute Pressure (MAP) sensor.
    6. Defective Engine Coolant Temperature (ECT) sensor.

    System Too Lean. This code will set when an air fuel ratio sensor (O2 sensor) gets lazy.

    Also, check for a vacuum leak on that side.



    Jan 26, 2011 | 2003 Toyota Corolla

    1 Answer

    Hi can help me to fix code po125 on 2003 toyota corolla yuo know i try to fix but still came back the same code po125 , i change engine temperature coolant sensor and 02 oxyge sensor also 02 heater sensor...


    Did you reset the Computer after you did the repair? After you replace a sensor that has stored a fault code you need to reset the computer in the car to clear the stored codes. Auto Zone or O'Rielley's may do it for you or try removing the Negative battery terminal for 60 secs.

    Jul 04, 2010 | 2004 GMC Envoy

    1 Answer

    I have check engine light code po125---p1139 toyota 4runner v6


    PO125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP CONDITIONS.POSSIBLE CAUSES - LOW COOLANT LEVEL - STUCK OPEN THERMOSTAT OR FAULTY ENGINE COOLANT TEMPERATURE SENSOR. DID NOT SEE CODE P1139.

    Apr 25, 2010 | 1999 Toyota 4Runner

    1 Answer

    PO420


    Not just a faulty catalytic converter will trigger this code. Many other issues can trigger this code.

    • Leaded fuel was used where unleaded was called for
    • An oxygen sensor is not reading (functioning) properly
    • The engine coolant temperature sensor is not working properly
    • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
    • Delayed spark timing
    • The oxygen sensors in front and behind the converter are reporting too similar of readings
    Possible solutions:
    • Check for exhaust leaks at the manifold, pipes, catalytic converter.
    • Replace Coolant Temperature Sensor
    • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
    • Inspect the downstream heated oxygen sensor (HO2)
    • Replace the catalytic converter
    • Have timing adjusted


    Aug 25, 2009 | 2002 Toyota Camry

    2 Answers

    P0172 and P0128 Error Code 2003 Trailblazer 4WD


    PO172 means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). I would replace the thermostat first. The computer could be injecting too much fuel because it thinks it never gets to operating temperature. That may keep the light off.

    Jan 28, 2009 | 2003 Chevrolet TrailBlazer

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