In a nutshell, you have the right to cancel from the moment an order is placed until 14 days after taking delivery of the car.
It doesn’t matter if it’s a new or used car, the law is the same.
The dealer must provide you with details of their returns/cancellation policy.2 May 2019
How long after buying a used car can you return it?
Dealer return policies
If you buy a car from a dealer that explicitly allows returns, you’ll typically be able to take the car back as long as you follow the terms of the policy. Policies may restrict this to a certain time period (seven days, for example) with certain mileage limits.25 Jul 2019
Can you change your mind after buying a used car?
If you’ve changed your mind after agreeing to buy a car, you’re often out of luck. A contact to purchase a vehicle is legally binding. Although you may have heard of a three-day “cooling-off” period that allows you time to change your mind after a purchase, it doesn’t apply to cars in any state.
Can I return a car that I just bought?
Long story short, you want to return the car. Most stores let you return clothes and products for a refund if you regret the purchase. You might wish you could void your purchase contract and simply give the car back to the dealer. But unlike other consumer products, it’s not easy to return a car.