PCV on the Tec moved to the "I can actually see it and get to it" position in 04.
Good question on when Ford went to CAN...... at least up to 05, and I think 06/07 on the Taurus, it was a hybird CAN/SCP/PWM system (not including the weird audio system network), with the codes / PIDs, etc coming out in CAN format. I dont think Ford went to a 100% CAN thru the whole in car network until 08 MY. How far back is a CAN compatable scan tool needed? I am thinking 01 or 02? I dont remember for sure if the wifes 01 Vulcan (totaled in 04, but saved her life in the process) was CAN output or not.