GMC Yukon XL 2500 Problem Report
GMC Yukon XL 2500 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.
WHARE DO I FIND THE SRCONDARY AIR INTAKE CHECK VALVE, IF CLOUGED DO I CLEAN OR REPLACE?
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