Take note of the blurb regarding NISSAN products below A code P0128 may mean that one or more of the following has happened: Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
The error code indicates that Coolant Temperature Below Thermostat Regulating Temperature.
Usually the problem is with an faulty thermostat and it will end up overheating the car.
There are possible chances of accumulation of debris or dirt in the coolant which will require a coolant flush to be done.
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2006 Nissan Sentra PO128 . I just replaced thermostat and anti-freeze (very simple). The car has no heat but the temperature gauge is reading normal. Any help would be greatly appreciated! From what I am reading it looks like it may be the (ECT) Engine Coolant Temp sensor.Does anyone no where the ECT is located and if this is most likely the problem? Any help is greatly appreciated
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