How to sell a car that has a lien on car gurus?

I don't think Car Gurus gets involved with the closing transaction. Make an appointment to meet your buyer at your bank. Some of the money the buyer pays for the car will satisfy the lien holder, the bank. They will then release the car's title to the buyer. Any additional money goes to you, the seller. Keep insurance on the vehicle until all the paperwork clears. The bank will help you do this.

Talk to your lien holder first!

What if the car is upside down

If your car is upside down call a tow truck. ;)