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      04-16-2022, 06:59 PM   #5
DukeofAlexandria
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Drives: 2007 E85 Z4 / 2013 E93 M3
Join Date: Apr 2018
Location: Maryland

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2013 BMW M3 E93  [0.25]
2007 BMW Z4 E85  [3.25]
Quote:
Originally Posted by W3N View Post
Hello all,

I recently installed a HFC Xpipe from Active Autowerk paired with Eisenmann Race Muffler. After the installation, I went for a drive and CEL popped up. Apparently it is the o2 sensors and all 4 of them have faulty code. They can be cleared when car is running, but it will come back on every time when start up the car. When starting up, it will first appear as a CEL then turn to service engine soon and on dash shows increased emission. Car is running great and did not notice anything wrong with it. Any solutions for this issue?
Like DrFerry said, you realize you need a tune to use this setup, correct?

-Duke
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