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I use the wifi Elm with OBD Fusion on my iphone 4 on my 2001 boxster, Works well.
VW crapped out yesterday and generic reader found no codes. Didn't want to run extension chords to where the car was parked to use the laptop, (battery was dead). iPhone is always on me and I keep the elm in the oddments box, the elm and iphone pinpointed the faulty crank sensor that hadn't thrown the code but was pending...
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