Ok so my service engine soon light came on in my 99 7.3l. Truck is still running well so I assume it's a sensor of some sort. My problem is I used the diagnostic obd2 reader at advanced auto and it couldn't communicate with my trucks computer. I have beans tunes and don't know if that would interfere. I've tried getting ahold of someone there but I know they're super busy and I've been playing phone tag for a couple days. Does anyone have any insight into this issue? I'll apologize in advance if this isn't posted in the most appropriate place. Still a newb on the forum and trying to find my way around. Thanks for any input/suggestions!