Conquering P0491 Empowering You with Expert Insights

It was running like a dream, but recently threw a code. P0491. I checked the code and it's the secondary air Injection. I have had the hardest ... The air injection pump is failing or the fuse has blown. It's a high-current fuse (40A if I recall). For troubleshooting, I would look from the load side of ... P0491 Secondary Air Injection System Insufficient Flow. Stumped. My VW CC 2010 is having a check engine light with the code P0491 which ... 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. SEL: P0491 Secondary Air Injection System Insufficient Flow General BMW Z4 Forum. It is a round valve with a small vacuum hose attached at the top rear. Remove the OEM diverter valve, and set it aside. The new parts (Autozone ... The high probability fix of the P0491 & P0492 error is to replace the secondary air valve. The valve is prone to fail over time (seize) and not ... 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 ... The description is "Secondary Air Injection System Insufficient Flow Bank 1 and same for Bank 2. Any one else seen these before. Could spirited ...