Accessing OBD Port

[DailyRam]

When we talk about tuners and how the dealership can tell how many times you've accessed your OBDII port, how do gadgets like Verizon's Hum+ factor in.
Would using one of those devices leave the same digital footprint that a tuner would? Same for any of those item like the progressive snapshot or other gadgets.
Thoughts?

 

[WilliamS]

Most "gadgets" read only they do not write to the system. I have a few 10 dollar ones that will read codes, see live data, and clear a check engine light that connect to my cellphone through bluetooth. I think eveyone should have one. The only way anyone would see it was connected is if you cleared the CEL or like a programmer where it writes a map. Just like a file on your computer its dated when it was written.

 

[DailyRam]

Cool, thanks for the clarification on that. i was wondering how that all worked and what footprints were left behind.