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      07-25-2018, 04:53 PM   #3
MONSTAR's Avatar

Drives: 2013 F30 328i
Join Date: Sep 2016
Location: Irvine, California

iTrader: (0)

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:
Schwartz II | M3 Front Bumper | M Sport Rear and Sideskirts | JB4 - Map 1 | ER Catless Downpipe | Injen Intake | 437m | H&R Sport Springs | Hankook Ventus V12 Evo2 | Carbon Fiber Interior | Carbon Fiber Diffuser | Muffler Delete | Carbon Fiber High Kick Spoiler