Temp is too low should be 195-200degF
Some one may have installed 180degF thermostat thinking cooler is better, it isn't, but not the end of the world either, next time you need to change coolant or are working on something requiring you to drain the coolant swap out thermostat for correct 192degF.
You will get better MPG, and oil will stay cleaner.
Good article here on reading live scan data: MOTOR Magazine Article | MOTOR Information Systems
And yes, starting new threads is unnecessary, and confusing
You have a 2002 Ranger with 4.0l SOHC engine, what problems are you having?