Understanding Diagnostic Port

[jsmithepa]

So I understand modern cars have these diagnostic port, u plug in a gadget, BAM! tells you what's going on.

Question#1: Is this standard for all cars/brands, I mean is, one tool suffice for my Honda as well as my Mercedes?

Question#2: For street-Joe, knows enough cars to be dangerous, how about a cable to my iPhone and the App got all the smarts to explain all the archaic diagnostic codes am looking at?


Can it be this easy?

 

[drivinfast247]

Most passenger vehicles use the OBD2 standard. This is a plug usually located under the dash near the drivers seat.

They have a few Bluetooth OBD2 transmitters that plug into the port and transmit data to your phone.