Toyota 25051-20040 Exhaust Manifold Converter Sub-Assembly

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Disconnect the cable from the negative battery terminal.

Working from the center out, tighten the nuts.

Yes, the following procedure applies to either exhaust manifold.

Replacement procedures vary based on model year and engine type. Always ensure the catalytic converter has cooled before servicing to avoid injury.

Disconnect the electrical connectors from the left upstream oxygen sensor.

The catalytic converter is an emission control device added to the exhaust system to reduce pollutants from the exhaust gas stream. There are two types of converters: the conventional oxidation catalyst, which reduces hydrocarbons (HC) and carbon monoxide (CO), and the three-way catalyst, which lowers the levels of oxides of nitrogen (Nox), hydrocarbons (HC), and carbon monoxide (CO). For models from 2001 to 2006, there are three catalytic converters: a warm-up three-way catalytic converter (WU-TWC) in the front exhaust manifold, another in the pipe from the rear manifold, and the final three-way converter in the main exhaust pipe.

If the clearance exceeds the limit, have the manifold resurfaced at an automotive machine shop. Then, position new gaskets over the cylinder head studs.

You will need the exhaust manifold gasket: 17173-20030 and the flange gasket: 90080-43036.