Yes you do need a special tool to replace the O2 Sensor.
Was the problem diagnosed by a trained mechanic with a scanner tool? You want to make sure you are fixing the correct problem, and you want someone to fix it who is a trained BMW mechanic. If the problem is fixed incorrectly, it can cost you so much more to get it fixed correctly afterwards.
Best of Luck,
〉 Answered on Feb 22nd, 2007 by Amy Mattinat, Owner and Author at Auto Craftsmen Ltd
Was this diagnosed by an authorized BMW technician? Make sure this is something that needs to be done. Check out our expert's advice below. You should take the vehicle to yoru BMW dealer or to an ASE certified technician near you. You can find one by goin here: