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You might plan to refuel when your fuel gauge reads one-eighth of a tank of gasoline. Some people choose to refuel when the gauge reads one-quarter of a tank remaining.
You probably have a faulty fuel gauge sending unit.
Defective fuel sending unit.
The 2001 Audi A6 runs on premium unleaded (required).
The 2001 Audi A4 runs on premium unleaded (required).
The 2001 Audi A8 runs on premium unleaded (required).
The 2001 Audi S8 runs on premium unleaded (required).
The 2001 Audi TT runs on premium unleaded (required).
The 2001 Audi S4 runs on premium unleaded (required).
Either your engine coolant temperature is HIGH , your oil pressure is LOW , or your fuel gauge reads at or near empty
Generally the fuel gauge sending unit located in the fuel tank is at fault for incorrect fuel level readings.
In the gas tank