2009 Kia Spectra: OBD Code P0128?

Its Emission related issue most possible part to be checked in this case is Thermostat.

See the detailed definition defined for this problem:-----

The P0128 is fairly straight forward, and the most common problem here will be a Thermostat that is stuck "open". An open stuck thermostat means an increase of the engine warm up time and can cause emission increase as well. To detect open stuck thermostat, the ECM checks measured coolant temperature as soon as calculated coolant temperature reaches threshold and sets DTC P0128 when measured coolant temperature is lower than threshold.

See the help diagram shown below:----



This details will help.
Thanks.

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