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.
Air Injection Reactor System: Description
The Air Injection Reactor (A.I.R.) system is used on all engines except some 2.0L 4-cylinder engines. This system is designed to reduce hydrocarbons (HC) and carbon monoxide (CO) emissions.
This is accomplished by injecting air into either the exhaust port of the cylinder head, exhaust manifold or catalytic converter. The A.I.R. system operates at all times and will by-pass air only for a short period of time during deceleration and at high speeds.
The air management valve performs the by-pass and diverter function. The check valve protects the air pump from damage by preventing a backflow of exhaust gases.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.