Question about 2001 Kia Sephia

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My check engine light came on in my 2001 Kia Sephia. I took it to Auto Zone and they plugged it in the read out said, PO128 Coolant Temp Below Thermostat and Regulatin Temp. What does that mean and how do I fix it?

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Maybe a bad thermostat,change termostat

Posted on Sep 17, 2010

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1 Answer

Check engine light comes on after a few minutes of idling


Take Kia to Auto Zone, thay offer free diagnosing on check engine lights

Mar 22, 2011 | 1999 Kia Sephia

1 Answer

PO121 code still on, replaced o2 sensors, replaced cracked air tube, put seafoam in gas. reset computer, light came back on after 40 miles. same codes. DIAGNOSTIC TROUBLE CODES PO171 System Too Lean...


PO121 : TP Sensor Performance = The PCM supplies 5V to the TP sensor(throttle position). The TP sensor is a variable resistor that drops the voltage to about 4 volts at WOT(wide open throttle) to less than 1 volt at closed throttle. Some TP sensors are adjustable. others have a learn procedure to determine closed throttle. PO171 Fuel Trim System Lean = In closed loop the PCM adjusts fuel delivery based on H2OS 1 readings and is indicated by long & short fuel trim values. If lean the PCM will add fuel (fuel trim above 0%) & if rich the PCM will reduce fuel(fuel trim below 0%) PO128 ECT Below Thermostat Regulating Temperature = possible failed thermostat, low or empty on coolant, Engine Coolant Temp Sensor, Poor connection/Harness/Wires, faulty PCM Connection. I think you hit the nail on the head , the ECT Sensor ( which is different than the temp sensor for the dash gauge)

Jan 18, 2011 | 1999 Kia Sephia

1 Answer

Getting codes PO431, PO421, PO128


2003 saturn vue, we dont have the engine size, the codes should be and are the same, po 128 means; cooling temp is out of spec, make sure the coolant is full, then replace the coolant emp sensor and make sure the connection is good, i would also replace the thermostant, this is a common code on these and most of the time its the coolant temp sensor or thermostant, ive learned to replace then both to avoid future engine lights with code po128. next we will check the code # po421, this code is that the computer sees that the cat converters are taking to long to warm up, code po 431 is also the same as po421, this code is related to the thermostant and sensor, the sensor give the computer the wrong temp readings and then the compuetr thinks the engine is hotter than it is and thinks the converters should be also hot like the motor but the coolant temp is giving a false reading, if you replace the coolant temp sensor and the thermostant and fill coolant , then reset the light and you will solve the problem, i hope this is helpful, also the sensor is located to the right of the engine if you are standing in front of the motor, heres a picture of the sensor, remember to check connector heres a pic of the connector, good luck.johnjohn2_20.jpg

Nov 10, 2010 | 2003 Saturn VUE

1 Answer

What do the codes PO455 and PO128 mean on my kia sephia? I was told my fuel canister is only purchased at dealer ...is that true>


P0455= Evaporative Emission System Leak Detected (large leak)
P0128=Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Nothing here says buy a new can!
it could be as simple as turning the gas cap three clicks past tight,that is a very common thing,The other thing shows you should change your thermostat

Dec 24, 2009 | 2001 Kia Sephia

1 Answer

Check engine light is on. error reads PO128 and


hi 128 is coolant temp below regulating temp 405 is










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hi 128 is coolant is below regulating temp 405 is<erg/swsr/ckt low> hope this helps please rate this answer












Nov 20, 2009 | 2002 Saturn L-Series

1 Answer

Po128 code on 2001 corvette


replace the thermostat. computer sees engine is running too cool thermostat stuck open.

Nov 10, 2008 | 2001 Chevrolet Corvette

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