Yes they come with the book as to what code is supposed to be, also in most repair books there will be a list of the codes. Be sure to cross reference both to see if they transtale to the same thing.
The auto parts store may be a lot more expensive.
If I'm not mistaken Advance may "loan" the reader.
So far the one from Harbor Freight has worked on every Ford and Chrysler products I've stuck it to.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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