Demystifying P0491 A Technical Guide for Success

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. 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 ... Cold is a relative term. The engine coolant temperature needs to be under 104F/40C otherwise the SAP pump WILL NOT be commanded on. If you have ... Ffs love the car… but these issues lol!! Left engine mount leaking needs replacement, front controll arms bushings torn, then P0491 air ... Case #1: Audi · Check the vacuum element and flap in front of the intake manifold. · Inspect for leaks in the vacuum line. · Consider replacing ... SEL: P0491 Secondary Air Injection System Insufficient Flow General BMW Z4 Forum. 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 ... The dual codes indicate a system failure. A system failure can be due to one of the following: 1) Air pump failure - This is a fairly common ... Sensor with the hose: https://amzn.to/3UlZBe9 Valve: https://amzn.to/3ViCOjE VW Scan tool: https://amzn.to/49hIRZn Power Probe 3 ... The code it's showing is p0491: Secondary Air Injection System Insufficient Flow Bank 1. The thing is, I'm fairly certain that I do not have SAI.