t2 scans look identical to t1 and t3, when you get close to the event (red ring on the map), the event will say what tier number it is [Tier 1], [Tier 2], [Tier 3]. when you double click the motivation in your inventory it will come up with a buff on your bar, blue motivations change your scanner to track tier 1, green will look for tier 2, yellow will look for tier 3.
if you're following the scan but there is nothing there when you get there, it may be a case of other players have done it before you got there.