Wrong forum you need the e46 section
but hopefully this helps...
bank 1 sensor 1 is the the sensor closet to the front of the car that can be seen when looking at the headers
bank 1 = first 3 cylinders
closest one is the sensor that whats being read.
but if you do one just do all to get them out the way
Last edited by BMRfanatic; 01-19-2013 at 12:03 PM.