audi a3 , went out cloned a key in the meantime put hex+can in to get the details to register it, went in to engine then out again never did anyting, after cloning the key tried them and no keys work, not enven trying to turn over lights on in dash, been on to hex in america he did a few tests found nothing , sitting in the car now waiting for an hour to hopefully clear the fault but be glad of any help please 07930301530, many thanks