Chevrolet Express 3500 Problem Report
Chevrolet Express 3500 Check Engine Light Due to Restricted Secondary Air Injection Check Valve
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 came out when it was still 210,344 miles - since then, i have replaced the o2 sensor twice but the light keeps coming back. engine runs well. - Visitor
A Loose or worn gas cap may cause Check Engine Light to illuminate.
My van has a check engine code of p1345 ignition control and also a secondary emission control...
The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engin...
A loose or worn gas cap could be cause the Check Engine Light to illuminate.
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