Secure and preserve the product in a safe place along with any documentation including packaging, instruction booklets, manuals, warning labels, recall documents, etc. This includes wrecked vehicles, burned parts, etc. Indeed, there can be no products liability case without the defective product itself. If you cannot personally secure the product, put everyone on notice of your desire to preserve the evidence, including third-party owners, tow truck operators, wrecking yards, impound lots, and insurance companies that may have taken possession of the vehicle.