This is what I use . Software that you load on your laptop and comes with a 20' (I think ) USG cable with OBDII interface . Do anything the dealer can.
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OE-Level Coverage - autoenginuity
Coverage, Coverage, Coverage Independent service shops and vehicle tuners require more information than what OBDII can provide to do their job effectively. Since the OBDII standard covers only emissions-related powertrain systems and sensors, there is a lot information you won't be able to see...www.autoenginuity.com