Secondary Air System Monitor Secondary air systems are used to jump start a cold catalytic converter and to cut down on cold start emissions. A catalytic converter must reach approximately 400° to 600°F in order to properly reduce emissions. When a cold engine is started, a large amount of fuel is unburned due to the “quench” effect of the cold combustion chamber and cylinder head. That unburned fuel then enters the cold catalytic converter where there’s not enough oxygen to burn it off. Lacking extra oxygen and heat, that raw … Read More
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