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Terms of the pay out and discharge of the lien on trade-in.
You traded-in your vehicle when you purchased another vehicle.
If there is an outstanding loan on the trade-in (a lien), that loan needs to be paid off. The purchase agreement should have details about how that will happen.
If there is an unpaid lien on your trade-in vehicle, check your purchase agreement for pay out details. These details may be in a section called “lien pay out on trade-in”. This section sets out the terms of the pay out and discharge of the lien.