Trouble code P0501 means:Vehicle speed sensor range/performace
Trouble code P0811 means: Excessive clutch slippage
replace spark plugs @wires
The 2002 Volkswagon Jetta OBD 2 port is under dash at left side
The 2003 Volkswagon Jetta OBD 2 port is "in cavity at bottom of dash, between steering column & kick panel"
The OBD II connector is what your looking for on Jetta III models remove the ash tray then slide the pannel to the right of the ash tray over the ash tray opening.
it is number 2
You need a factory scantool or aftermarket scanner that will read transmission codes. A basic obd code reader at parts stores will not read transmission codes.
What does obd code P0740 mean
it in by the cigaret lither there is a lil cover on it with the engine sine on it.
This site offer free OBD code lookups on all cars: http://www.actron.com/
plug a obd 2 code reader into your car and activate it.