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.
Average mileage: (–)
Exhaust & Emissions affected: Gasoline
6 people reported this problem
Verified for the GMC Sierra 250013 reports
Verified for the GMC Sierra 250011 reports