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.
Catalytic Converters: Operation: Notes
Catalytic converter oxidizes hydrocarbon and carbon monoxide gases into harmless non-polluting gases. The over-temperature control system components work while coasting fuel cut device is engaged to prevent rich mixtures from reaching converter.
When converter reaches about 1350°F (732°C), due to high load conditions, air pump system air is diverted to atmosphere via action of the air switching valve and vacuum switching valve. This helps reduce chemical reaction in catalyst, which would create even higher temperatures.
Above 1830°F (999°C), warning lamp and buzzer will be activated, indicating an over-temperature condition. Such may be caused by misfiring engine.
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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.