1997 Audi A4 Quattro Questions

Unanswered 1997 Audi A4 Quattro Questions

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The OBD says TPS problem. Does the throttle body need to be cleaned or TPS replaced?
I'd like to avoid going to a Dealership, for an over-priced scan + towing fee. According to Dealership I need their scan tool, said it'll take about a hour.
function switch improper signal will this cause no reverse ?
The speedometer did not work when I bought the audi.I am getting fault code p0501.i know it has to do with a sensor, but what sensor and where is it located in the car.
Need to know how to install speed meter sensor