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      06-14-2012, 04:08 PM   #1

Drives: 335i LCI
Join Date: Feb 2008
Location: Home

Posts: 809
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O2 sensor relocation


has anyone relocated the O2 sensors behind the secondary cats?

My premise is: the further away the cat is from the turbos, the less restrictive it is due to pressure drop - is this true?

If my premise is correct, then it is more beneficial to get catless DPs and relocate the O2 sensors, rather than get catted DPs and cut out the secondary cats.

So... is anyone running relocated O2 sensors with catless DPs and not throwing a code...?