Code
P0128
Cooling
Thermostat sous la température de régulation
Le moteur n’atteint pas sa température normale, souvent un thermostat bloqué ouvert.
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Most likely causes
- Thermostat bloqué ouvert
- Niveau de liquide bas
- Capteur de température défectueux
Symptoms you may notice
- Check engine light
- Engine warms up slowly
- Weak heater output
Checks to run
- Verify coolant temperature reaches about 90 °C
- Test thermostat opening temperature
- Check coolant level
Tools you may need
OBD-II scanner
Infrared thermometer
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.