OBD vs OBD2 Scanner: What the Names Mean and Which Tool Your Car Needs
OBD is the family of diagnostic standards and OBD2 is the 1996-and-newer version, so the real decision is between a phone-based adapter and a handheld.
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Code Reader vs Scan Tool: Which Modules Each One Reaches and What It Can Command
A Code Reader reads and clears engine codes; a Scan Tool reaches more modules and can command them. The decision comes down to which modules and commands.
