The Car-Pass is printed on special paper that contains a hologram to make counterfeiting and fraud much more difficult. Do you suspect your document is a forgery or the odometer readings are incorrect? You can scan the QR code or fill in the identification number here. What you will see on the screen should match with the data on the document. If this isn't the case or if you get an error message, then most probably the document is a fraud or has expired since quite some time.