how to fix P0128 code in Ford F-150 12th Generation (2009-2014)

Learn how to diagnose and fix P0128 code in Ford F-150 (2009-2014). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid any electrical issues during repair.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Coolant drain pan
• Pliers

2. Drain Coolant

• Place a coolant drain pan under the radiator.
• Open the drain valve on the radiator and allow the coolant to drain completely.
• Close the drain valve once all coolant is drained.

3. Remove Thermostat

• Locate the thermostat housing; it is typically at the end of the upper radiator hose.
• Disconnect any hoses connected to the thermostat housing.
• Remove the bolts securing the thermostat housing using a socket set.
• Carefully lift the thermostat housing to access the thermostat.
• Remove the old thermostat from the housing.

4. Install New Thermostat

• Clean the mating surfaces on the thermostat housing and engine block to remove old gasket material.
• Place the new thermostat in the housing, ensuring it is oriented correctly (usually with the spring side facing the engine).
• Apply a new gasket or gasket maker as needed.
• Reattach the thermostat housing and secure it with bolts, tightening them to the manufacturer's specified torque.

5. Refill Coolant

• Reconnect any hoses that were removed.
• Refill the cooling system with the appropriate type of coolant, using a mixture of coolant and water as specified by the manufacturer.
• Bleed the cooling system to remove any air pockets by running the engine with the radiator cap off until the thermostat opens, allowing air to escape.

6. Reconnect Battery and Clear Codes

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0128 code and any other related codes.