This is my first encounter of a coil 'melt down', usually they just crack and loose power. Get another coil and keep it in the glove box or trunk.

I don't mind coil overs, just that they don't have enough air flow over them to keep them from getting too hot and breaking the plastic. Remember, the original single coil design always had the coil on the cool fender, with a large heat sink.

As for the code reader, what model is it? Some of the older models will not work with the CAN systems used in new cars.
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Keeping it running is better than buying new