Rebecca,

The Secondary Air Injection System is part of the polution control system and should be covered under GM Warranty. Call your local dealer to confirm before you bring it in.

In the meantime, look for any cracked or disconnected air lines or loose electrial connections near the intake manifold or top of the engine (or any line that looks like it may pump air into the exhaust manifolds where they exit the engine).

Secondary Air Injection Systems typically add air to help burn off noxious emissions, but if there is a break in the air supply line anywhere, the sensors will detect a change in air flow.

Hope this helps!