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Originally Posted by Punisher3.0si
Id be interested in more in depth info on how those Sims work without knowing when the DME tests the cats. Under the right conditions the computer will dump fuel and then lean it out to see how much oxygen the cats can hold. It does this by watching the downstreams react accordingly. Unless if BMW uses a different testing technique.
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You should email them directly at "support @ area 74 (one word) dot ca", I'm sure they can answer your questions.