P0491 A Comprehensive Guide to Troubleshooting Secondary Air Injection System Issues

I have the infamous code P0491, and have been troubleshooting the secondary air pump system on my 02 M5. Took the cover off and verified the ... Ford Focus P0491 Trouble Code Repair Disclaimer: This video is not meant to be a definitive how to.Always consult a professional repair ... And this video will be diagnosing a p0491 secondary air injection low-flow on this Volkswagen Passat with a 2.5 L engine. 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 ... P0491 and P0492 indicate that you have insufficient air injection flow into the exhaust manifolds. The oxygen sensors are looking for a leaner ... New article discussing fault codes P0491 P0492 on N62 V8 engine. Secondary Air Injection System Fault Codes P0491 P0492 BMW 5 Series 2004 ... 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 ... Get P0491 OBD-II code: Secondary air injection system insufficient flow. Know common triggers, repairs needed, and find RepairPal certified shops for ... The PCM will set the 0491/0492 codes based on what the O2 sensors see. So if there is a link then perhaps the faulty PCV valve is changing the exhaust mixture. A quick global scan revealed the fault code P0491 for Secondary Air Injection System Bank 1, Insufficient Flow Short with Power – Intermittent.