On a 1993 to 1999 A3 Jetta:
The camshaft position sensor is in the distributor (the hall sensor).
To remove & replace it, you need to remove the distributor.
On a 1999 to 2005 A4 Jetta:
The camshaft position sensor is located behind the camshaft sprocket.
You need to remove the timing belt & the camshaft sprocket to
remove & replace the sensor.
In both cases, you need to be sure that TDC for #1 does not get
moved, or if it moves. That everything is put back to the correct
#1 TDC alignment points.
Saturday, March 17th, 2012 AT 4:45 PM