Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Secondary Air Injection System
Due to over-enrichment of the mixture during cold start, an increased amount of unburned hydrocarbons exists in the exhaust gas. Injection of secondary air improves oxidation in the catalytic converter, speeding up start-up time for catalytic converter, and reducing emissions during cold start-up.
Secondary air injection system components include:
- Secondary air injection solenoid valve.
- Secondary air injection pump motor.
- Secondary air injection combination valve(s).
- Secondary air injection pump relay.
- Various hoses, check valves, wiring and harness connectors.
To test secondary air injection system components, see appropriate DTCs under DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.