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As long as that cap in installed (plugged in) the 16-pin OBD port in the car should work 100% for emission testing.
With the addition on the small wire link shown in the other pictures, the 16-pin ODB port in the car should work 100% for all diagnostics, emission testing included.
Ensure the 20-pin cap is on and go for the test. At least, that's how it should work.
If the emission testing station is trying to connect via the 16-pin when the 20-pin cap is off (open) it will fail.
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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
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