What are the three wires of the Audi fuel level sensor?

[LeEvan]

Audi fuel level sensor's three wires are the fuel level signal wire, fuel gauge ground wire, and low fuel level signal wire. Below are the detailed introductions of the three wires of the fuel level sensor: 1. Fuel level sensing wire: The voltage of this wire changes with the fuel level in the tank. 2. Fuel gauge ground wire: This ground wire is different from other grounding wires. It is a ground wire connected from the dashboard to the fuel tank sensor for accurate measurement of the fuel level in the tank. The resistance value between this wire and the vehicle frame is 0 or approximately 0 (Note: Use the 200 ohm range on a multimeter for measurement). 3. Low fuel sensing wire: When the fuel level is below the minimum point (warning point), the sensor switch closes, connecting this wire to the fuel gauge ground wire. The low fuel warning light on the dashboard will be illuminated. When the fuel level is above the minimum point (warning point), the low fuel warning light turns off.