What if a Borrower loses the car key? If a Borrower loses your key, they will pay to get you a new one. You will need to have a spare key so that you can keep using your car in the meantime. Have more questions? Submit a request Comments Malcolm Shipway 20 June 2017 18:13 A new key to my car is expensive and it also needs to be linked to the car via the car dealership. Will this be done at no cost to me, if a client loses a key?