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How to Code a Renault Trafic Replacement Key Renaults have a complicated system as far as the immobiliser locks and keys are concerned. This can make coding the replacement key a challenge. Many people assume the only solution is to go to an authorized dealer, but this could be a long and expensive process. The AVDI Renault Commander is a fantastic tool that covers a broad selection of models for the most affordable cost. It uses an OBD cable that plugs directly into the OBD connector