im trying to replace the o2 sensors on my 2011 x5 35i but is there a diy online somewhere? the upstream sensor the one at the top is impossibe to get to does anyone have an idea how to get that sucker out. i tried pb blaster, heating it up, wax nothing works and there is not enough room to work on this thing. its driving me crazy and on top of it all it wasn't even the sensors that needed replacing but too late now i cut the wires on them.

thanks for any help...