Empower Yourself Understanding P0491 and Its Solutions

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 ... Sensor with the hose: https://amzn.to/3UlZBe9 Valve: https://amzn.to/3ViCOjE VW Scan tool: https://amzn.to/49hIRZn Power Probe 3 ... The code it's showing is p0491: Secondary Air Injection System Insufficient Flow Bank 1. The thing is, I'm fairly certain that I do not have SAI. The dual codes indicate a system failure. A system failure can be due to one of the following: 1) Air pump failure - This is a fairly common ... 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 ... Need to erase this codes for a 2010 Q5 3.2 FSI. Thanks in advance for your help. Attached Files .rar ... This system is only used at cold start and has no effect on the performance. It injects air into the exhaust manifolds for more complete fuel burn. Note that the MAF sensor signal in the fresh air inlet stream has to be accurate. Also know that the air pump shouldn't shut off (stall) the ... P0491 Secondary Air Injection System, Bank 1 - Insufficient Flow. P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow. 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 ...