P0491 Uncover the Root Causes and Empower Yourself with Solutions

S4 (B8 Platform) Discussion - P0491 & P0492 Secondary Air Injection System Insufficient Flow - I have these two codes that I can't get rid ... 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 ... P0491 and PO492 - **SOLVED!** ... I have a recurring CEL P0491 and PO492. Any ideas? No search result shows up on this forum... ... this code is a ... Since this just started after replacing your head lights and the secondary air pump is usually located behind or just under one of the head ... 2017 coupe. Runs fine and set this code yesterday. Know it is secondary air pump system failure. Only 15k on this car. My 2016 got flooded and totoled. It soon turns out quite obviously to be a disconnected hose. The hose connects the SAI pump outlet to the Combi valve. Below pictures show the problem and ... Turns out that a line from the secondary air injection system was disconnected. Pretty sure it happened at the full service at BH Lambo. Share your videos with friends, family, and the world. Hi guys, Can anyone help with fault code P0491 and P0492 as in how to fix ? The diagram shows the check valve that is installed in the intake has a single vacuum line that runs to the vacuum canister, however the check valve in my car ...