Mine doesn't seem to be hitting closed loop after hitting 210* coolant temperature. Do the oxygen sensors play a part in going into closed loop because I think my drivers side is shot, it sticks at .453 and slowly rises, very slowly, at 210* it goes to .487 and stops.

 

Oxygen sensors will definitely do it. Replace it and I gaurantee it will go closed loop.

Oh yeah, sorry I haven't been on MSN lately, internet here has been on the fritz.