[hypoxia]

would a normal crowfoot work with it?  something special with this tool?

tom

A 7/8" crows foot would work if you could fit it in.  Would more than likely have to be ground down.  The NOx tool can be had for less than $10 at Harbor Freight etc.  I suppose a 7/8" flare nut wrench may also fit.  Not much real estate available in there.  The normal oxygen sensor socket is too short for this sensor, at least the ones I tried.  I'm on the road, most of my specialty tools are not with me.