Vehicle sales taxable?

Let's assume I bought a car cheaply from a company, never registered it and sold it again after a week for a profit (+€2,000) because I found a buyer by chance... Do I have to pay tax on this, i.e. include it on my tax return? The Internet is sometimes said to be not as an object of daily use, but given the fact that I had never registered it for myself, it is. Some of these are also contributions from 2008. Will e