You need to scan the car. The fault light will be logging a fault and is the place to begin diagnosis.
The crankshaft position sensor can cause hot start issues when they start failing and is a good suggestion (and a relatively inexpensive part), but you should see what the computer thinks is wrong first and move forward from there
SOURCE: Petrol gauge faulty on audi a4 2001
Most likely the sending unit for the guage is defective, it is located in the fuel tank.
SOURCE: audi dash lights
If it is the display for the gears flashing, this indicates a fault with the gearbox system, this is more common on multitronic gearbox's
SOURCE: where is the crankshaft position sensor locator on a 2003 audi a4
The crank position sensor is located on the forward front of the engine block, on the left side, down low by the crank pulley
SOURCE: How can I take the dash cluster /screen out on my Audi A4
You must remove instrument cluster out of car. After that you can take the instrument cluster screen out.
For removing instrument cluster out of car you must remove left bottom plastic cover above pedals and upper plastic cover behind steering wheel, see picture below.
Refit all in reverse order.
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