I can't tell how the product works because for some reason the OBD II connector didn't fit my car. Specifically, a 2002 Mercedes Benz C320. My $20 OBD-II adapter worked with no problems, but it's only for reading engine trouble codes. I only bought this to find problems with the entire machine and read all the codes. I either have to buy an adapter for my model or I get another one from a different brand. However, I sent it back as I don't need it. And for $260 to require the purchase of an additional adapter, no thanks. It would be nice to know that beforehand.
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