Engine - Diagnostics

DTC P0128 COOLANT THERMOSTAT (ENGINE COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)

DTC DETECTING CONDITION:
- Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:
Thermostat remains open.

CAUTION: After repairing or replacing the defective part, perform the Clear Memory Mode Clear Memory Mode and Inspection Mode

Step 1-2: