The intent of the P0128 code is to indicate a faulty thermostat. Coolant circulates heat away from the motor and outside of the car. Many modern cars, trucks, and SUVs rely on a fluid called antifreeze or coolant to keep the engine at optimal temperature. Many modern cars, trucks, and SUVs rely on a liquid called antifreeze or coolant to keep your motor running at an optimal. P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. Supersession (s) : 21230-6N200 21230-8P300 21230-EL00A 21230-EL00B 212306N20A. Helps regulate the flow of coolant between engine and radiator. Supports your engine's optimum operating temperature. Whoever told you to run it without a thermostat simply doesn't know what they are talking about. Supersession (s) : 21230-EL01B 212303RC1A. If the engine runs too cold, it will also be unable to burn off any condensation that may occur in the crankcase. If that was the problem, and I replace it, should I expect the SES light to go off Or does the SES light stay lit until it is independently reset. I take it that the first thing to look at (and possibly replace) is my thermostat. The quicker the engine reaches normal operating temperature, the faster it will enter closed loop. My problem code is reading PO128, and the coolant level is full. OReilly Auto Parts carries thermostats for your Nissan Sentra, along with radiators, water pumps, hoses, and coolant for a complete cooling system repair. On a computer controlled engine, the engine needs to reach a specified operating temperature in order to enter closed loop, when the ECM will use input from the oxygen sensors and adjust the fuel trim accordingly, so the engine will run more efficiently. While I can understand the thinking that the hot temps don't require it, there are a couple of problems that can occur. Personally, I would install the thermostat. This means that either your temperature sender is bad or the coolant isn't getting hot enough. If it does, the gauge is working and the circuit is good. With the key "on," the gauge needle should go to full hot. Disconnect the harness connector from the temp switch and ground it.
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