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I have recently purchased a Audi A6 1.8t petrol auto 2003 the problem i can see with it is the rev counter moves erraticly when you turn on the fan/use the electrics or just turn the steering while stationary. also has a knocking sound when turning right. the car is 1 day old from a dealer with warranty. gave asking price on the deal that he serviced the car from audi and changed all the necessary and gave it in good working order.
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I am not familiar with this model but petrol engines usually use a signal from the ignition system for the rev counter and diesels need a special sensor. However the rev counter is almost certainly unsuitable because petrol engines tend to rev much higher than diesels.
You can take it to most auto parts stores such as O'Reilly's or AutoZone and they will scan for diagnostic trouble codes (DTC) that may be set in the computer.
check the condition and tension of the drive belt. Check that the battery terminals and posts are shiny clean and tight. Have the battery load tested for faulty cells. Have the alternator tested for output
Probably a break inside wiring loom of one/more of the three wires that eventually connect to the speed sensor on top of gearbox. The break I fixed in my 2003 Leon 1.6SX was in the loom under battery tray. My symptoms were no speedo working, and erratic fuel guage (particulary when under 1/2 full). I repaired one broken wire.
Jim Nichol Seat leon 2003 problem with speedo not working and fuel gauge faulty is...
You must check up all spark plugs, eventually change spark plug set (4 pieces), and fuel filter placed on bottom right side near reservoir. Also you must clean inside throttle valve control unit, see picture below:
Refit all in reverse order.
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