Audi A6 sedan in the course often this happens: After fill up the tank, the fuel warning lights. In order to eliminate hidden faults, a lot of users to the service station to replace the oil level sensor. Fuel warning light is no longer lit, but users do this to spend at least 60 dollars. After careful research I found that the root cause of the fuel warning light, and does not find a feasible method for parts repair. As long as a thread, you can solve the problem, but can save 50 or 60 dollars.
After the fill up, to lift the float so high that reaches the contact position of the edge in contact with the slider and the oil level sensor, and sometimes disconnected, so that the resistance will be large, at a position corresponding to lack of oil, the fuel warning light of course it will alarm.
Repair method presented here is very simple, wrapped Jisi cotton stopper on the float arm oil level sensor, so that when the float arm is in contact with the stopper plate, contacts and slides will not disengage, fuel gauge pointer will instructions accordingly tank is full, the warning light will not be lit.