Fejlkodeindeks · medium
P0128
Coolant thermostat range / performance
Coolant thermostat range / performance
Scope: 2.5L/3.0L gasoline · System(s): EMS OBD II · Factory MIL flag: 2
Common causes
- Contaminated coolant Engine coolant thermostat failure ECT Sensor failure (ECT Sensor DTC(s) also flagged)
- Defective Engine Thermostat
- Defective Engine Coolant Temperature Sensor
- Defective Intake Air Temperature Sensor
- Defective Cooling System
- Low Engine Coolant
- Defective Thermostat
- Defective ECT Sensor
Quick checks
- Confirm freeze-frame and conditions when the code set
- Compare live sensor values vs expected (unplugged/biased sensors are common)
- Check intake boots, PCV, and vacuum lines for splits (very common on aged X-Types)
Typical fixes
- Check/Replace Thermostat
- Check Coolant Level
- Replace ECT Sensor
- Check coolant
- replace thermostat/ECT sensor