What is the role of the Secondary Air Injection system in reducing emissions during cold starts?

The Secondary Air Injection system reduces emissions during cold starts. It includes an AIR pump, shut-off valve, and pressure sensor. Filtered air goes from the engine's air filter housing to the pump, then to the shut-off/pressure-sensor assembly on the exhaust manifold. A scan tool is recommended for a thorough inspection. The AIR solenoid/shut-off/pressure sensor should be replaced as a complete assembly.

Genuine Chevrolet Cobalt Secondary Air Injection Check Valve

SAI Check Valve

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2 Secondary Air Injection Check Valves found

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Chevrolet Cobalt Valve Kit, Secondary Air Injection Check
Part Number: 12623091
- Other Name: VALVE KIT, Emission Control System; Check Valve
$155.21 MSRP: $322.28
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Fits the following Vehicles:
2009-2010 Chevrolet Cobalt | 2 DOOR, 4 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 4 DOOR, LEVEL ONE (LS) 2 DOOR, LEVEL ONE (LS) 4 DOOR, LEVEL TWO (LT) 2 DOOR, LEVEL TWO (LT) 4 DOOR | 4 Cyl 2.2L
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Chevrolet Cobalt Valve Assembly, Secondary Air Injection Shutoff & C
Part Number: 12619076
- Other Name: VALVE, Emission Control System; Check Valve
- Replaces: 12594394
$182.54 MSRP: $434.60
You Save: $252.06 (58%)

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Fits the following Vehicles:
2006-2008 Chevrolet Cobalt | 2 DOOR, 4 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR, LEVEL ONE (LS) 2 DOOR, LEVEL ONE (LS) 4 DOOR, LEVEL THREE (SS) 2 DOOR, LEVEL THREE (SS) 4 DOOR, LEVEL TWO (LT) 2 DOOR, LEVEL TWO (LT) 4 DOOR | 4 Cyl 2.2L
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Chevrolet Cobalt Secondary Air Injection Check Valve Parts Questions & Answers

Valve Kit, Secondary Air Injection Check
12623091
Q: What is the role of the Secondary Air Injection system in reducing emissions during cold starts?
A: The Secondary Air Injection system reduces emissions during cold starts. It includes an AIR pump, shut-off valve, and pressure sensor. Filtered air goes from the engine's air filter housing to the pump, then to the shut-off/pressure-sensor assembly on the exhaust manifold. A scan tool is recommended for a thorough inspection. The AIR solenoid/shut-off/pressure sensor should be replaced as a complete assembly.