[Barefeet]

Thanks, spacedout I did as you said. I had to use a screwdriver to pry the plug off. There is no way I could pull it off without damaging something.

 

[Barefeet]

Mine unplugs easily. I wonder what caused yours to get stuck.

Tight tolerance I guess. I'm taking it in for NOX sensor I don't want grief about the ScanGage II.
I may try some Teflon bike chain lube around the inside of the plastic.

 

[Barefeet]

I lubricated the edge of the plug slightly, however it was still very tight so I took the needle nose plyers and removed the small guide on the plug. It now goes on and off easier.