my Toyota Highlander Third Generation (2014-2019) has an inaccurate fuel gauge, how to fix it

Solution

1. Preparation

• Gather tools and materials.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent electrical shorts.

2. Access the Fuel Sender Unit

• Tools Required: Socket set, screwdriver set.
• Remove the rear seat cushion (if applicable) or access panel to reach the fuel tank.
• Unscrew and remove the access cover to the fuel pump and sender unit.

3. Inspect and Test the Fuel Sender Unit

• Disconnect the electrical connector from the fuel sender unit.
• Use a multimeter to measure the resistance of the fuel sender. It should vary between 0-90 ohms as the float moves.
• If resistance is outside the normal range, replace the fuel sender unit.

4. Replace the Fuel Sender Unit (if necessary)

• Remove the retaining ring using a suitable tool.
• Carefully lift the fuel sender unit out of the tank.
• Install the new fuel sender unit by reversing the removal steps and ensuring a proper seal.
• Reconnect the electrical connector securely.

5. Reassemble and Test

• Reinstall the access cover and rear seat cushion.
• Reconnect the battery.
• Start the engine and check the fuel gauge functionality.