Hello,
unfortunately it is indeed a fraud; the car doesn't exist and the seller hinself is the scammer. The EUR 500 are most likely gone by now.
So what you need to do is the following:
1. Read the following topics:
viewtopic.php?f=2&t=1885viewtopic.php?f=2&t=1860It's the same scammer; please compare all those various entries:
http://escrow-fraud.com/index.php?page= ... layout=171As you can see there is a number of previous sites that also specifically targetted victims in Ireland.
2. Using all this information file a police report. Make them aware that this is organized crime.
3. If this was a bank transfer try to have you bank reverse it or have you bank at least notify the receiving bank. Have your bank fax a copy of the police report to the receiving bank.
4. Please post additional information, most important the email address of the scammer and the bank details. You can also post how you came across the ad.