Originally Posted by wpoll

Emission checks via the 16-pin ODB port in the card should work on any E53 X5, as far as I understand.

Early cars have emission data ONLY on the 16-pin in the car - all other modules must be accessed via the 20-pin under the hood(bonnet).

BUT, the 16-pin inside the car will only work if the correct cap is installed on the 20-pin under the hood (bonnet). This cap loops the appropriate data lines back to the 16-pin connector. Without this cap in place, the 16-pin connector is dead.

At least, that my understanding of how things are arranged in the early E53 cars. Later cars have everything on the 16-pin ODB port.