It could be a scam. Everything on the internet is suspicious to me. Especially links and email messages asking for passwords. I found this information.
http://auto.howstuffworks.com/car-selling5.htmCertified Check Scams - This scam is often perpetrated on sellers of used cars over the Internet. A buyer indicates that he wants to buy the car and pay with a cashier's check. At the last minute, the buyer creates a reason why he needs to write the check for more money and have the seller wire him the difference. The check turns out to be a fake, but it is often discovered long after the seller has wired the money. In addition, the seller is responsible for covering the money for the fake check. To avoid check scams, call the issuing bank before you accept the check and wait for the check to clear before you transfer the car into the buyer's name.
