Calibrating Fuel-Level Sensor System

→ Avoid contact with hot parts or sources of ignition.

→ Use suction to remove ignitable vapors.

→ Attach warning sign in a clearly visible position.

→ Avoid contact with hot parts or sources of ignition.

→ Use suction to remove ignitable vapors.

→ Attach warning sign in a clearly visible position.

→ Avoid contact with caustic fluid.

→ Wear personal protective gear.

→ Ensure that there is good ventilation.

→ If you do come into contact, wash off immediately with plenty of warm water and contact a doctor if necessary.

Information 

• Tank calibration is necessary after replacement of the fuel tank, fuel-level sensor or instrument cluster. Calibrate the fuel-level sensor system - after replacing the instrument cluster - only if the function Read out values cannot be performed! 
• The fuel-level sensor system need not be calibrated if the battery was disconnected or a plug connection on the instrument cluster or fuel-level sensor was removed. The values remain stored in the instrument cluster. 
• A range on remaining fuel of less than 15 km is not displayed in the instrument cluster. 

Empty the fuel tank, e.g. see → Checking Quantity Delivered By Fuel Pump 

1. Fill the fuel tank with 13 litres  of fuel, metered by volume.
2. Wait for a short time to allow the tank sensor to settle down to the level.
3. Connect the Porsche System Tester to the vehicle and start the System Tester. Switch on the ignition. [>>] Continue.
4. Select vehicle type, then go to the list of control units.
5. Select Instrument cluster  control unit, then press [>>].
6. Select the Special functions  menu, then press [>>].
7. Select the Tank check  menu, then press [>>].
8. Carry out the tank calibration; the tester gives a reading in litres, which is then synchronised to 13 litres  .
9. Check position of tank needle in instrument cluster. Tank needle in lower third.
10. Fill vehicle with fuel and check the fuel gauge in the instrument cluster. Wait a few minutes. Fuel gauge shows full.