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Ok, so I have a 95 powerstroke, i was letting it run the other day and out of nowhere the check engine light came on. So i shut off the truck and hooked up my snap on spouse, put in the info and went to check codes and found no codes. So i went to data stream and scanner will not communicate with the truck. So i pulled out my blue point generic scanner and checked for codes with it, I again got nocodes and scanner would communicate. Went back to the snap on and again no comm. I was using the info port, so i would figure that's my comm link. Am i missing something here. What can't i pull a live data feed. And thoughts would be greatly appreciated.