One or both secondary air injection check valves may become restricted causing poor air flow resulting in illumination of the Check Engine Light. It is often recommend to replace both check valves even if a fault code is set for only one bank of cylinders. Replacing only one valve may result in a return trip to the repair shop.
Check Engine Light Due to Restricted Secondary Air Injection Check Valve on GMC Yukon
Average mileage: (–)
7 people reported this problem
0 people shared problem details
check engin light is on & from time to time the tighten gas cap message comes on
check engine light on .. scanned spark plug 4 replaced. cleared code. got gas . light came back...
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
My 99 Yukon has brand new tranny and motor. Was driving and it suddenly cut out like it was goi...