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.
Pulse Air Injection System: Description
The Pulse Air Injection Reactor (PAIR) system is used on some 2.0L 4-cylinder engines.
This system is a non-pump type air injection system. This system uses engine exhaust pulses to draw fresh air into the exhaust system.
This helps to further oxidize hydrocarbon (HC) and carbon monoxide (CO) emissions. A single pulse air valve is used.
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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.