Conquering P0411 The Ultimate DIY Guide

Some customers may comment that the Malfunction Indicator Lamp (MIL) is illuminated. The Technician may find DTC P0411 (Secondary Air Injection ... What is a P0411 code? Does this have something to do with the AIR pump? Everytime we test the car the system comes on there's power at the ... The overall code seems to be related to secondary air injection so I thought perhaps this might be the turbo diverter valve. I belive it is the dreaded C-word. Basically your pre-cat O2 sensors are telling the computer that they are not detecting enough oxygen on COLD ... Most of the time with this code it is the check valve on the head that freezes up and won't open. Thus, when the pump runs, no flow is detected ... Due to the possibility of the faucet being a "customized build" product, the user is responsible to first compare the existing cartridge needing replacement ... The secondary air injector is the leaf blower on the passenger side engine. The motor goes out usually because the relay is junk and gets stuck closed. A common issue with GM, VW and Audi vehicles are air injection flow codes like p0410, p0411, and p0412. OBD-II code P0411 means you've either put the one-way valve backwards, have a leak or loose vacuum hose or routed them incorrectly. It came up as P0411 Secondary Air Injection System Incorrect Flow Detected. Any ideas what this could be? The car seems to be fine with no funny noises.