Quote Originally Posted by Martbspike View Post
I read somewhere, not sure how true it was, that vw had introduced a security measure to stop wireless hacking, by needing the bonnet, (hood) to be open to accept coding.
The "diagnostic firewall" with the hood shut is definitely something that exists on very new models. I'm not sure if it applies to your Transporter, though, and VCDS is also supposed to detect and inform you if the diagnostic firewall function is active.