how do I stop my vehicles data from being transmitted to the obd11 connector under the dash, is there a single pin that can be removed/disconnected that will do this? (VW new beetle 2001)
Data is not transmitted to the OBD 2 connector port, this is an interface which allows you to plug diagnostic equipment into the wiring loom of the car.
You could conceivably remove the port from the loom, i.e. make the port dead, but it would be far easier (and have the same effect) to unplug the device from the port.
Interesting side-note, the mileage is not actually available via standard OBD 2 diagnostics on a VW Group cars. It is possible to access the number of revolutions that the wheel speed sensors have observed and then work out a calculation to see how close the odometer reading is.
What problem is it that you're hoping to solve?