Tesla has scaled back its used car warranty to give customers only one additional year or 10,000 miles (16,000 km) of warranty coverage.

Under the previous warranty, used Model S and Model X customers were offered an additional warranty of up to four years or up to 100,000 miles (whichever comes first) from the date of shipment, in addition to the original new car warranty that had not expired.

The Tesla China website is also now adjusting the additional warranty period for used cars to one year or 20,000 km.

Tesla China announced on Friday that it was discontinuing and canceling its confidence guarantee scheme, meaning that consumers will no longer be able to return their vehicles without a reason within seven days of taking delivery.

Under Tesla's previous confidence guarantee policy, consumers who were dissatisfied with their new Tesla vehicle could return it to Tesla within seven calendar days of delivery, the Shanghai Securities News said, citing legal sources.