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Originally Posted by BMWguy206
Sorry for bumping an old thread. Just had a customer with a 2010 M3 with 136k miles. Had fault code 27B0 for Secondary Air System, insufficient air flow, for bank 1. Performed a test plan and it called for to replace pre-cat o2 sensor. Pre-cat o2 sensor was already replaced at the dealer due to same fault code. We removed the non-return valve for the secondary air system behind the cylinder head. Found that the port behind the head is clogged with carbon deposits. Recommended to remove cylinder head so that carbon build up can be removed. Customer declined repair and is going to trade it in for another BMW.
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You can tell him to get a tune
