my Skoda Octavia's fuel gauge is not working correctly, how to fix?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety before performing any electrical work.
• Ensure you have enough space to work under the rear seat or access the fuel tank.

2. Access the Fuel Level Sending Unit

• Tools Required: Socket set, screwdriver, safety gloves
• Remove the rear seat or access panel to reach the fuel tank.
• Unscrew the cover of the fuel pump assembly to expose the sending unit.

3. Inspect and Test the Fuel Level Sending Unit

• Disconnect the wiring harness from the sending unit.
• Using a multimeter, check the resistance across the sending unit terminals while moving the float arm through its full range. Resistance should change smoothly between approximately 0 and 90 ohms.
• If the reading is inconsistent or out of range, replace the sending unit.

4. Replace the Sending Unit (if necessary)

• Tools Required: Torque wrench, replacement sending unit
• Remove the old sending unit by unscrewing it from its mounting.
• Install the new sending unit, ensuring it is properly seated.
• Torque the mounting screws to the manufacturer's specifications (usually around 10-15 Nm).

5. Reassemble and Test

• Reconnect the wiring harness to the sending unit.
• Replace the fuel pump assembly cover and re-install the rear seat or access panel.
• Reconnect the battery and turn on the ignition to check if the fuel gauge operates correctly.