Quote:
Originally Posted by cuban_bmwx5
when i went in for the test the emission computer would not communicate with the car and the 20 pin cap was closed not open so i got a fail and i went to another place and i got the same thing.. but i just seen that picture u posted and my cap does not have that jumper i see that u have is that what i need?
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You shouldn't need the jumper for just emissions testing - the jumper on the cap is to enable access to the modules other than the engine and trans (via the 16-pin ODB connector), as the later E53 cars have.
Emission testing via the 16-pin connector was a legal requirement in some countries from as early as 1995, hence BMWs half-arsed solution to get it working on the early E53 cars.
In your case either the cap is incorrectly installed, faulty or you may have some other issue. I guess adding the jumper can't hurt, so why not try it?