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I just realized. You (they) might be talking about "trip failures".
In most cases a code requires 2 trip failures to set.
In your case it is possible the additional codes where trip failures which means they had one trip failure (each) and had not yet "matured", or had not yet ran through 2 failed trips...which sets the "hard" code.
No, most scanners (except dealers' or an expensive SnapOn scan tool) will not read trip failures.
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