I just purchased a 2006 3.7L Jeep Grand Cherokee Laredo with 167k miles and it is working great. This is the first time I have had a car new enough to have ODB II (Last truck was a 95) so I purchased an ODBII tool and the "ODB Fusion" app for my iPhone.

Everything looks good, but under "Daigonistoics" and "On Board Monitoring (Mode $06)" There is one red X. The line says "TID $84 - Manufacture Defined" and the value is 0.488 (Min is .061 & Max 100).

Google searches have not turned up much yet. What does this mean, and is this something I should be concerned about?

Thanks!