After the estimated engine coolant temperature rises above 77☌ (171☏), the actual engine coolant temperature is less than 77☌ (171☏) even though the specified time has passed. The total time when the amount of intake air is small is less than the specified time. The intake air temperature subtracted from the intake air temperature when the engine is started is less than 10☌ (18☏). The coolant temp sensor is responsible for telling the Engine Control Module (ECM) the engine’s coolant temperature. The P0128 OBD-II trouble code is a generic powertrain diagnostic code (it has the same meaning for the Jeep Wrangler as any other vehicle). its P0128 - 'Coolant Thermostat (Coolant Temp Below Thermostat Regulating. The P0128 OBD-II trouble code is a generic powertrain diagnostic code (it has the same meaning for the Dodge Journey as any other vehicle). i used my actron cp9145 and read the p-code. P0128 Definition: Coolant Temp Below Thermostat Regulating Temp. hi, my 'service engine soon' light came on 2 weeks ago. Intake air temperature is more than -10☌ (14☏). P0128 Definition: Coolant Temp Below Thermostat Regulating Temp. note: i originally had this in the e46 forum but decide this is a better forum so I deleted the other post. Engine coolant temperature is between -10☌ (14☏) and 60☌ (140☏) when the engine is started. The P0128 OBD-II trouble code is a generic powertrain diagnostic code (it has the same meaning for the Mazda 3 as any other vehicle). Again a guess and interested in others thoughts, especially those with repair experience. P0128 Definition: Coolant Temp Below Thermostat Regulating Temp. This would be a cold soaked engine where it is close (within 10 degrees C) of ambient temps. My guess would be the ECT is subtracted from the IAT is a difference of less than 10 degrees C. The following is from ALLDATA but I believe they have a misprint in the line stating "intake air temperature is subtracted from intake air temperature." Low engine coolant level Leaking or stuck open thermostat (likely) Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor Faulty. Vehicle Application: 2001 Accord 2.3Customer Concern: The check engine light is on with a code P0128 for cooling system performance problem.Average Reported. The P0128 OBD-II trouble code is a generic powertrain diagnostic code (it has the same meaning for the Toyota Tacoma as any other vehicle). The P0128 OBD-II trouble code is a generic powertrain diagnostic code (it has the same meaning for the Subaru Outback as any other vehicle). P0128 Definition: Coolant Temp Below Thermostat Regulating Temp. This probably affected A/F ratios and killed power and mpg. P0128 Definition: Coolant Temp Below Thermostat Regulating Temp. That being said a bad MAF could disrupt the check conditions sequence and cause the estimated coolant temperature to be higher. I would not have initially thought a MAF would cause that but after reading into the code description I can see that the ECM uses the IAT (built into the MAF) to estimate what the coolant temp might be in certain cases.
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