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      05-06-2013, 11:18 AM   #57
epbb
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Drives: 2010 M3
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Quote:
Originally Posted by PINHEAD View Post
just to clarify...euro spec meaning there is only 2 holes for the pre-cat o2 sensor instead of the required 4, meaning you are the 2 post cat sensors that should be plugged in but because its "euro spec", its removed because it has nowhere to be plugged into, not ideal for US cars.
Just so I can learn, how is this not ideal for US cars? Are you saying that because US cars typically have four pre-cat o2 sensors (Two before the primary cat, and two below the secondary cat), and since this one only has two, you would have two pre-cat o2 sensors just laying around?

How would this affect the post-cat o2 sensors? Doesn't the US spec also have four post-cat o2 sensors?