Description
OBD-II Trouble Code Description for P0128 Mazda
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
What does this mean?
OBD2 Code P0128 Mazda definition:
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. The intent of the P0128 Mazda code is to indicate a faulty thermostat. Similar codes: P0125 Mazda In determining the engine did not reach a “normal” temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.
Symptoms
Possible sumptoms of OBD code P0128 Mazda
You will likely not notice any drivability problems other than the MIL illumination.
Causes
Possible causes of OBD code P0128 Mazda
A code P0128 Mazda may mean that one or more of the following has happened: Low engine coolant level Leaking or stuck open thermostat Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor Faulty intake air temperature (IAT) sensor
Possible Solutions
Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 Mazda OBD-II code: Verify coolant strength & level Verify proper cooling fan operation (check if it’s running more than it should). Replace if necessary. Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary. Verify proper intake air temperature (IAT) sensor operation, replace if necessary. If the above items check out good, replace the thermostat If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 Mazda code
The OBD2 Code Information Be Applicable For Mazda:
2013 Mazda MX-5,2013 Mazda MX-5,2013 Mazda CX-9,2013 Mazda CX-5,2013 Mazda 6,2013 Mazda 5,2013 Mazda 3,2012 Mazda MX-5,2012 Mazda BT-50,2012 Mazda 3,2011 Mazda 6,2011 Mazda 5,2011 Mazda 2,2010 Mazda 3,2009 Mazda 6,2009 Mazda 2 ,2008 Mazda 6,2008 Mazda 6,2008 Mazda 5,2008 Mazda 2,2007 Mazda CX-9,2007 Mazda CX-7,2006 Mazda MX5,2006 Mazda 6,2006 Mazda 3,2005 Mazda Atenza,2004 Mazda 6,2004 Mazda 5,2003 Mazda 2,2002 Mazda 6
Note:
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