P0491 The Comprehensive Guide to Emissions System Troubleshooting and Repair

The data shows there is no air mass moving across the sensor when system testing is activated. Whether that means the sensor is crap or the valve is stuck ... P0491. Says its the secondary air injection system. I went to my friends shop here in pittsburgh to check it then we cleared it. Car is running fine but it may ... I did replace the #8 (second air valve) and #7 (the hose to the air pump). I am thinking buying the air pump. In your thread, you replaced the pump, was it ... 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) It is a round valve with a small vacuum hose attached at the top rear. Remove the OEM diverter valve, and set it aside. The new parts (Autozone ... Audi A4 - P0491 and P0492?? - Got these codes saying Secondary Air System bak 1 and bank 2? What could this be? I had them reset and the CEL ... 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. Here is the schematic for an 03 manual: There should not be a vacuum line running back to the transmission area, if it is open you have a vacuum leak which can ... Q7 MK 1 Discussion - P0491 CODE help - Hey all, 2015 Q7, CODE P0491 Secondary Air Injection System, Insufficient flow Bank 1 Anyone else ... Find out everything about the P0491 fault code In this video, we will explore the description, symptoms, causes, and solutions to resolve ...