Posts Tagged: P0491 Secondary Air Injection

P0491 trouble code Chrysler

What causes a P0491 trouble code Chrysler Trouble code P0491 trouble code Chrysler is defined as Secondary Air Injection Excess/Insufficient Air Flow. Obviously the P0491 trouble code is related to a problem with the secondary air injection system. To understand the purpose of the secondary air system and to understand how it works, read this post Most likely cause of a P0491 trouble code The P0491- Secondary Air Injection–Excess/Insufficient Air Flow trouble code can be caused by a bad pump, bad check valve or a restriction in the tubing between … Read More