Just wondering if anyone else has screenshots like this? I find it fascinating but the fuel trims gauges make no sense to me at all. I'll post them another time.
Anyway, for under 15 bucks I can read my fault codes!

 

how does it plug it?

 

Bluetooth or WiFi adapter that plugs into the obd port.

 

You need obdii and a Bluetooth adaptor. Mine cost about $10 from eBay :-)
Then you need an android phone (I'd guess there's an iPhone version but I haven't checked) and the trial version of the app is free :-)

 

I use it to diagnose cars and trucks. Works well.

A tad slower than hand helds, but still fine.