code P0128 code pops up thermostat on 2004 Chrysler Sebring

ok so, I just got a full computer scan and the only thing popping up is the thermostat. code P0128 After that the service engine light went out. I drove for about 10 minutes then turned the defroster on. after driving for a few minutes the needle finally started going up. not too much but it was moving up. I tried all the heat settings and the service engine light didn't go back on. It seems like the thermostat only works a little after the cars engine is warmed up and then turning on the heat.. If it is a bad thermostat wouldn't the service engine light go on as soon as I try to use the heat? If it seems to be working a little after the engine warms up how would someone test for a sensor? I am going to try to turn the heat off before turning off the car then next time I drive wait a few minutes and then turn the heat on. I just want to see when the service engine light comes back on. Also are sensors for the ect and iat expensive to replace? and how are they tested?

by in Saint Clair Shores, MI on January 05, 2013
1 answer 1 comment
ANSWER by on January 05, 2013
your therm is either stuck open or is sticking at times,repl and reset service liht with scanner
COMMENT by on January 09, 2013
please read...why would someone break the top half of the themostat off and leave the base? also could bottoming out in the driveway on snow and ice cause a code to pop up on the catalitic converter? bank 2

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