Can I change my advert on Auto Trader to an auction? You can't change your advert to an auction. If you’d like to sell your car by auction: Remove your advert from Auto Trader Head to 'Sell My Car' and select the auction option Related articles How much is it to auction my car? Can I pause my advert? What is Dealer Auction? I've sold my vehicle, how do I delete it from Auto Trader? What do I have to do to auction my car?