P0491 Code Unraveling the Mystery and Restoring Engine Health

The car will need to be in closed loop or hot for the 02 sensors to read the air input correctly. 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 ... Error code P0491 which to my understanding is related to the secondary air injection system on bank 1(whatever it means, I guess cylinder 1) Those codes are for the following: P0491 - Secondary air injection system bank 1. Air mass too low P010F - Mass airflow system (Bank 1 + Bank2) :: Rationality ... That's a secondary air pump code. Either the pump is bad or the check valves are bad or there is a leak in one of the hoses. If there is a ... Turns out that a line from the secondary air injection system was disconnected. Pretty sure it happened at the full service at BH Lambo. Code P0491 Secondary Air Injection System (Right Bank). Subscribe. Feb 3, 2006 | 10:03 PM. The P0491 code indicates a fault with the system, typically indicating that the secondary air flow is too low on bank 1. Bank #1 refers to the side of the ... If you're seeing this code, it means the powertrain control module (PCM) has identified that the SAI system is dealing with insufficient flow. 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 ...