Unveiling the Truth about P0491 A Comprehensive Investigation

Hello Everyone, So I'm having this issue with makes my check engine to light up every now and then outputting this error code P0491 and ... I have a p0491 issue (Secondary Air Injection System Insufficient Flow Bank 1). Car runs fine, but I was curious about. Products | P0491, Appleton · Application: For use with toggle switch and 4 x 2-1/8 in box · Country of Origin: US · Cover Type: Toggle Switch · Finish: Galvanized ... If these valves can't open, there won't be any flow into the engine from the secondary air injection pump and the insufficient flow codes are ... It comes up with: P0491 Secondary Air Injection System Insufficient Flow Bank 1 P0492 Secondary Air Injection System Insufficient Flow Bank 2 Cleared the codes ... I have Codes P0491 and P0492 coming up for my 04 V8. Now I know that both are for the secondary air system bank 1 and 2 but how do I pin point the problem my ... P0491 Secondary Air Injection System, Bank 1 - Insufficient Flow. P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow. And this video will be diagnosing a p0491 secondary air injection low-flow on this Volkswagen Passat with a 2.5 L engine. The tube running from your intake elbow goes to the secondary air pump. What tends to happen is it splits somewhere or the attached sensor goes bad and codes ... I did replace the #8 (second air valve) and #7 (the hose to the air pump). I am thinking buying the air pump. In your thread, you replaced the pump, was it ...