P0491 A Comprehensive Guide to Diagnose and Resolve Secondary Air Injection System Issues

If you're seeing this code, it means the powertrain control module (PCM) has identified that the SAI system is dealing with insufficient flow. 2002 530i e39 - P0491 & P0492 Secondary Air Injection System (Bank 1 & 2) Emission rejected due to codes P0491 & P0492. 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 ... My VW CC 2010 is having a CEL with the code P0491 which means the pressure sensor is not detecting enough air being pumped from the intake into the exhaust. The P0491 code tell there is a fault with the system – usually that the secondary air flow is too low on bank 1. Sensor with the hose: https://amzn.to/3UlZBe9 Valve: https://amzn.to/3ViCOjE VW Scan tool: https://amzn.to/49hIRZn Power Probe 3 ... P0491 and P0492 indicate that you have insufficient air injection flow into the exhaust manifolds. The oxygen sensors are looking for a leaner ... This code comes back and I have to remove it to turn off the check engine light. I have been told I need a carbon cleaning and Audi will not honor an extended ... 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 ... Ford Focus P0491 Trouble Code Repair Disclaimer: This video is not meant to be a definitive how to.Always consult a professional repair ...