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The LEDs on the test box provide a quick indication of whether the power and ground wires to the vehicle's OBD II interface are functioning properly. Diagnostic port: OBDII. The LED light in the input socket can quickly display whether the power and ground of the OBD Il interface on the vehicle are normal.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.