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.
Car Problem Reports
Chevrolet Tahoe Check Engine Light Due to Restricted Secondary Air Injection Check Valves
Chevrolet Tahoe Problem
Exhaust & Emissions Affected: Gasoline
Average Mileage: 139,555 mi (134,111 mi - 145,000 mi)
Visitor, 2001 Chevrolet Tahoe, 134,111 mi
check engine light on diagonstic code p1416 something about secondary air injection bank 2. How do i fix that my self?