i got LEN405 to help change a ABS sensor on my mk4 recently (front left wheel)
Part cost £10 from ebay and about hour or so labour.
There is a really good thread on this forum with pics and everything.
Oh yeh, after changing the sensor, we realised that when i had car fitted with lowered springs, the wires that conected to the sensor
were not clipped prperly into place, so the front wheel was rubbing on the wheels and snapped, So did not need to change sensor really
But only noticed this after the hard work was done
Regards
Billy