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It helps you troubleshoot many things. If you see maf voltage spike or drop off at certain rpms, or see coolant temp spike or drop off randomly you can diagnose issues with wiring or sensors that way.
I guess you wouldnt believe me if i told you how many non tunable cars i have fixed with datascan and a consult cable.
Also, with consult you can lock basetiming for setting your timing, and you can clear self learn which enables you to reset your tps closed voltage.
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