If there is a vacuum leak anywhere between the engine and the mass air flow sensor, it will cause “unmeasured” air to enter the system Your car’s engine is essentially a large, powerful vacuum pump. The up and down movement of its piston creates a vacuum, which draws air into the engine to mix with the… Continue reading Vacuum Leak: Symptoms, Causes, How to Fix
Tag: vacuum hoses
P0491 Code: Secondary Air Injection System Insufficient Flow Bank
This is the OBD-II generated trouble code for Secondary Air Injection System Insufficient Flow Bank 1 that indicates that there is some problem on that side of the engine which contains cylinder 1..