Vw t5 4motion 2008 2.5
When i stick my ross tech in i get this message

Now i have an after market radio and worked after installed this also have done a test across pin 4 and 7 or the ground and k line 1 and get 6a
Recently had a recon engine fitted and now im gettin that the k2 line is short to ground k1 line seems to be fine and check with multi meter and not exciding 9v

Went near the obd to see k lines and if i unlink one of them i get a green light on my vcds plug but when all together get the red light
Unplugged everything after market and still same any one have any advice???