how to fix the P0128 code in my Skoda Octavia NFL (2020-Present)?

Learn how to diagnose and fix P0128 cooling system issue in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool before starting.
• Disconnect the battery to prevent electrical shorts.

2. Replace the Thermostat

• Tools Required: Socket set, torque wrench, coolant catch pan, new thermostat, gasket or sealant.
• Sub-steps:
  1. Drain a portion of the engine coolant into the coolant catch pan to prevent spills during removal.
  2. Locate the thermostat housing; typically found near the engine block.
  3. Remove the bolts securing the thermostat housing using a socket set.
  4. Carefully lift off the thermostat housing and remove the old thermostat.
  5. Clean the mating surfaces thoroughly to ensure a good seal for the new thermostat.
  6. Install the new thermostat, ensuring it is oriented correctly (check the arrow for direction).
  7. Reattach the thermostat housing and torque the bolts to the manufacturer’s specifications (usually around 10-15 Nm).
  8. Refill the engine with the appropriate coolant mixture.

3. Replace the Coolant Temperature Sensor (if necessary)

• Tools Required: Socket set, new coolant temperature sensor.
• Sub-steps:
  1. Locate the coolant temperature sensor, typically found near the thermostat housing.
  2. Disconnect the electrical connector from the sensor.
  3. Remove the sensor using a socket set.
  4. Install the new sensor and reconnect the electrical connector.

4. Reconnect Battery

• Reconnect the battery terminals, ensuring they are secure.