Nissan 20802-3S525 Three Way Catalytic Converter

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The catalytic converter is an emission control device that reduces pollutants in the exhaust gas stream, including lowering the levels of oxides of nitrogen (NOx), hydrocarbons (HC), and carbon monoxide (CO).

To check for a restricted converter, you can use a vacuum gauge to diagnose the effect of a blocked exhaust on intake vacuum. Connect a vacuum gauge to an intake manifold vacuum source, warm the engine to operating temperature, and record the vacuum readings at idle and at 2000 rpm. If the reading after the fourth test is more than one in-Hg lower than the reading recorded at idle, it may indicate a plugged or restricted catalytic converter.