Toyota 17104-50220 Right Exhaust Manifold Sub-Assembly

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The catalytic converter is an emission control device that reduces pollutants in the exhaust gas stream. It consists of two types of catalysts, the oxidation catalyst and the reduction catalyst, which work together to reduce hydrocarbon, carbon monoxide, and oxides of nitrogen emissions. If you suspect a malfunctioning converter, have it diagnosed and repaired by a dealer or authorized emissions inspection facility. Regular inspections should be done for leaks, corrosion, dents, and other damage. If any damage is found, replace the converter. To check for a restricted converter, use a vacuum gauge to diagnose the effect of a blocked exhaust on intake vacuum. If the exhaust system is restricted, replace the catalytic converter.

The procedure can be done to any exhaust manifold with either design. Start with the removal of the cable in question from the negative terminal of the battery. Next, lift the front part of the car and support it on the jack stands, and if the condition of the jackstand is questionable, replace it with a better one. Remove the front exhaust pipes from the exhaust manifolds, first of all, and then, disconnect the upstream oxygen sensors' electrical connections. Disconnect the exhaust manifold support bracket by unscrewing the three bolts of the component. Subsequently, undo the bolts that attach the exhaust manifold and then take out the exhaust manifold. Remove the old exhaust manifold gasket off the car. For installation, reverse the removal steps, ensuring to use a new gasket with the oval-shaped protruding tip facing the correct direction: it should be placed to the rear for the left manifold and to the front for the right manifold. Last of all, use a wrench to snug the exhaust manifold nuts to the required level of torque.

Reinstall the remaining parts in the reverse order of removal and use new gaskets when connecting the exhaust pipes.

The front exhaust pipes need to be unbolted and disconnected from the exhaust manifolds.

The oxidation catalyst and the reduction catalyst work together to reduce hydrocarbon, carbon monoxide, and oxides of nitrogen emissions.

Remove the exhaust manifold nuts and remove the manifold and gaskets.