I have a Carly adaptor, it lives in the glove box and connects by bluetooth to my Samsung Galaxy phone via the Carly App.
I paid for an upgrade a few years back, I cant remember how much but it seemed cheap at the time and I don't pay any annual fees. This payment allowed me extra functions such as registering batteries and resetting service indicators etc.
I have used it to read error codes and code in various things on my car including folding mirrors, disabling auto unlock and numerous other small things which I fancied.
For me it is a great tool to keep in the glove box and gives me instant access to diagnosing any problems that may occur while on the road.
It is to my mind, a really good, cheap item to own for anyone considering home maintenance although it has its limitations and there will be better (but possibly less convenient) readers on the market.
For me, for the money, it is well worth it!
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