I have a 2001 Beetle the ecm/computer fuse kept blowing and car would not start. I removed the top part of the dash and replace the ecm/computer with a used one off ebay. I matched the service numbers on both ecm/computers. Now the car starts ups but it shut down after 3 secs. The security light on the dash stays on. I took it to the dealer and they telling me I need a new computer because they cant communicate with this computer. The only problem is the security, what can I do, or am I doomed to buy a computer from vw????