i use a standalone obd2 reader.
i suppose with the smartphone way you need to figure out the bt connectivity issues with the handheld, any particular bugs on that side, then also bugs on the software with your phone/bt transmitter,etc... so it's hard to say besides just give it a try.
honestly using your phone for obd2 gauges and stuff is fun at first, but becomes real old later. that said, just get a standalone obd2 reader if one's looking to check and erase dtc's. if you want gauges, get a nuvi or scanguage type device.
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