P0128 330i and resolution

[keeler]

I have a 2006 330i with IDrive that is throwing P0128. I have replaced the thermostat, radiator, coolant, and both coolant temp sensors. The car heats up fine, pumps coolant great, and maintains a good temperature. Heat works, everything. I cannot get the SEL to go off. I have reset the battery and used a code reader. Does anyone have any tips on how to properly resolve this without just disabling the SEL?

[relative4]

Have you searched ISTA-D and/or newtis.info for diagnostic procedures? I'm particularly thinking about the wiring to the sensors.