Front O2 sensor--where is it??

Any help would be great. I know the front bank O2 sensor is supposedly near the 6th spark plug bank? Anyone with a diagram where the 6th bank is or where exactly the O2 sensor is would help. I have looked under the vehicle for some time with no luck. If it is under a heat shield(which I am assuming is the foil like material) than how is that removed without wrecking it. Thanks in advance.

there are only two oxygen sensors on our cars. One in the downpipe and one past the converter. The one in the downpipe is off the back of the engine, not the front.

take off the 2 motor mounts in front with a 15 mm wrench and socket....if ur car is facing slightly downhll this is easier....pull the motor forward from the alternator bracket and using larrge zip ties, zip tie it as close as u can get it forward......remove the strut brace...and clmb on up into the engine bay and there it is right in back...u need a special oxygen sensor socket to remove that and then install the new one..it also helps if the motor has been running a little bit before you remove it...i know its hot but it makes it a hella lot easier and reduces the risk of stripping something