im pritty sure erst doesn't have one, am i right?

the reason i ask is im going to get a diagnostics guy to come out in his van to have a look at my erst s2. i cant take it 2 anyone as it,s a project in a garage with no mot tax etc....

how is he going to find out what is wrong without a diagnostic plug?

how will he test if all the sensors ar working properly?
im sick of trying different parts with no sucsess
any advice would be great

thanks diesel