Secondary Air Injection Incorrect Flow (P0411) fix!
Secondary Air Injection Incorrect Flow (P0411) fix! >> Damaged or missing check valve; Replace the secondary air injection. Secondary Air Injection Incorrect Flow (P0411) fix! from forums.vwvortex.com My volkswagen would not pass emissions. after doing some research i found how to fix it. Holes or damage to exhaust components use. As far as symptoms of p0411. most often you will not notice any problems except that of an illuminated check engine light.