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      07-25-2018, 04:53 PM   #3
MONSTAR
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Drives: 2013 F30 328i
Join Date: Sep 2016
Location: Irvine, California

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If you update the firmware, it will not allow auto-delete (aka "suppress") the catless downpipe CEL. I haven't checked to see if you can manually clear it, but even if you can, it will return in 50ish miles. I've just left my CEL on for a year.

You can switch to boot mod3 which has the auto-delete feature or get an o2 sensor spacer:

https://f30.bimmerpost.com/forums/sh...=oxygen+spacer
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