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      03-02-2009, 03:04 PM   #33
dogears
My master volume goes to 11
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Drives: 2021 BMW M5 Competition
Join Date: Dec 2008
Location: Cherry Hill, NJ

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True, but the rear O2 sensors are no longer sniffing post cat O2 levels. The ECU most likely will eventually code as the O2 reading will be off the table.

Quote:
Originally Posted by KiokenM3 View Post
no cel because you still retain the factory o2 sensors. if you look at the pic of the system you can see where the o2 sensors mount
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