Hello there I've got a Y reg tt with bam engine when trying to plug computer in it won't connect to the car engine ecu but will let me read things on the instruments and multi function. Computer works fine on all other cars any help would be great

 

See an expert mechanic or automobile specialist if you can't get in contact with them and figure out the problem on your own. They could be equipped with specific equipment or know-how to diagnose and fix the issue.