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It does not show a check engine light. If your getting a SES notification you should check your codes. Pulling the plug has no harmful affects. The purpose of the flap is to warm the cats. If you live in a warm area it's not needed.
It will throw a shadow code so if your under warranty you will have to play dumb if the dealer see it.
Fault: Exhaust flap control / activation of the exhaust valve / Outlet valve
- Code: BMW 2F6C
Other wise the exhaust note is awesome.
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