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Dave Nova
Dave Nova, ASE Certified Tech
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Experience:  ASE Master Certification. GM World Class Certification
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device called that you plug into your machine

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With regards XXXXX XXXXX John Deere equipment, what is the device called that you plug into your machine and it diagnoses problems? A "doctor". I'm looking to buy one online but do not know what to call it.
Hello and thank you for using justanswer.

What you are looking for is a "scan tool" Most of the John Deere heavy equipment utilizes the Hitachi DR EX scan tool.
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