Yeah, ok, replacing the temperature sensor did not help. It took about 450 miles, several drive cycles but it came back. When the temperature readout goes to ---F, it does not mean that the temperature sensor is bad. I hooked up my scan tool to find out that the temperature is logged correctly. After I stop the car and turn the ignition on, the temp indicator will still be ---F. The moment you clear the codes using the scan tool, the temperature readout resumes. So, basically, the ---F is set by the ECM when the P0128 is either set or is pending. I stand corrected, next step will be replacing the thermostat.
Vin 3705: Mysterious Loaded 12.16.05
Alluring lines and an affordable price tag explain the appeal of this little convertible.
1977 XJ12L, 1993 Silverado, 2002 Altima, 2003 Ultra Classic, 2006 Solstice