P0491 Master the Diagnosis and Repair of Secondary Air Injection System

Hello Everyone, So I'm having this issue with makes my check engine to light up every now and then outputting this error code P0491 and ... Note that the MAF sensor signal in the fresh air inlet stream has to be accurate. Also know that the air pump shouldn't shut off (stall) the ... S4 (B8 Platform) Discussion - P0491 & P0492 Secondary Air Injection System Insufficient Flow - I have these two codes that I can't get rid ... The car will need to be in closed loop or hot for the 02 sensors to read the air input correctly. Possible Causes · Fuse or relay for Secondary Air Injection Pump faulty · Hose(s)/Piping between Secondary Air Injection Pump and Combi (Secondary Air Injection) ... If you're seeing this code, it means the powertrain control module (PCM) has identified that the SAI system is dealing with insufficient flow. 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. Ford Focus P0491 Trouble Code Repair Disclaimer: This video is not meant to be a definitive how to.Always consult a professional repair ... The tube running from your intake elbow goes to the secondary air pump. What tends to happen is it splits somewhere or the attached sensor goes bad and codes ... Share your videos with friends, family, and the world.