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Plug & Play: No battery needed. Turn on ignition, the OBD2 port will power the code reader. Warning: LAUNCH U300. 1 x LAUNCH U300 Code Reader. Read the fault codes of CHECK ENGINE & Transmission: with code explanation, you can find the problem very quickly.
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.