Mini OBD2 Bluetooth Scanner Tool for $5 + free shipping
free shipping

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Sgbyincons via eBay offers the Mini OBDII ELM327 Bluetooth Automotive Diagnostic Scanner Tool for $4.57 with free shipping. That's tied with last week's mention as the lowest total price we've seen. (It's also a current low by $4, outside of other eBay sellers.) This wireless Bluetooth device scans OBDII codes for 1996 and newer cars, light trucks, and SUVs to reveal the reason you're getting a "check engine" light on your vehicle.