Nearly all TTAC readers and writers have wrenched on a vehicle equipped with the OBD-II diagnostic system. Having a handheld code reader in yer box of tools can help douse that infernal check ...

These code readers are available in four different lines, depending on the features you need. All of them share the same core elements: 2.8-inch screen, ability to display 20 data points ...

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A cheap code reader capable of performing basic tasks like reading and clearing DTCs is probably all that you'll need for sporadic diagnostic work.