BAFX Products (TM) - ELM 327 Bluetooth OBD2 scan tool - For check engine light and other diagnostics - Android compatible
(It wouldn't let me post the link. Search that on Amazon.)
It doesn't connect to the Bluetooth on my iPhone4 though. I would have had to download a special app from the Apple store, but it was pretty expensive. I have a laptop and another smartphone that did connect fine. And for both I downloaded a simple free reader and they worked great.
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