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 Chevrolet Express 1500
Average mileage: (–)
8 people reported this problem
0 people shared problem details
A Loose or worn gas cap may cause Check Engine Light to illuminate.
One or more fuel injectors may become stuck closed causing an engine misfire and the Check...
The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engin...
First problem code PO300, repairs made, replaced plugs, wires, rotor and cap. Problem went awa...