Looks like they are little mini catalytic converters in the adapter. The O2 screws into the mini cat. The sensor then sees a "catalyzed" input so no code is thrown. Pretty cool stuff. Doesn't change the fact that your exhaust will still stink if you don't have at least one set of cats there.
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Originally Posted by BimmerRob08
Can someone explain what these "Lambda" Adapters do please? From what I gather on the forum is they must go over or cover the o2 sensors or somehow trick the sytem in thinking they sense the correct levels and don't through CEL codes, is that correct? What is the application? What exhaust mods are they used for? Are they reversable? Installation? Thanks,
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1987 Buick Grand National, 2009 BMW E90 M3, 2016 Audi S6, 2018 MB E63S AMG, currently in 2021 M5 Competition