I tested on two vehicles that are known to have issues that were verified by O'Reilly Auto Parts using their OBD-II system. Both vehicles showed zero results and we tried using multiple compatible apps. Returned to O'Reilly and got the correct (expected) results a second time. This device is no good. Simply does not work at all. The apps may be fine, but the device is not reporting.
Bottom Line: No, I would not recommend this to a friend
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