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      02-27-2013, 09:53 AM   #51
Dackelone's Avatar
Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

Posts: 16,345
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Originally Posted by GrahamSP View Post
Great DIY, will this cause an O2 sensor error? I wouldn't think so since the O2 sensors are upstream of the secondary cats, but just want to make sure. Thanks!
No, no CEL on a N54. The secondary cats are just THAT, second in line... so there are no O2 sensors for them. Only for the main cats - which are still there an functional.
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