Free OBD2 Code Reading: What a Store Scan Shows and What It Hides
A free scan tells you which engine code triggered the light, but it is not a diagnosis and it cannot see ABS, airbag or transmission faults.
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How Much Does a Scan Tool Cost? Price Tiers by What They Can Read
Scan tool prices track one thing above all: how many vehicle systems the device can see. Here is what each tier buys, what it cannot do.