Toyota 25051-0H040 Exhaust Manifold Converter Sub-Assembly

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Disconnect the negative battery cable and raise the vehicle on jackstands. Remove the lower splash shields and apply penetrating oil to the exhaust pipe bolts. Remove these bolts and separate the exhaust pipe from the manifold, taking care not to damage the oxygen sensor. Remove the lower exhaust manifold braces and oxygen sensor connectors. In the engine compartment, remove the upper heat shield and detach the manifold and gasket. Scrape off old gasket material from the manifold and cylinder head. If the gasket leaks, replace the warped manifold. Position a new gasket over the cylinder head studs, noting any directional marks. Install the manifold and tighten the nuts/bolts from the center out. Reinstall the remaining parts in reverse order and check for exhaust leaks after running the engine.

Reinstall the remaining parts in the reverse order of removal, using new gaskets when connecting the exhaust pipes. Finally, run the engine and check for exhaust leaks.

The front catalytic converter is incorporated into the exhaust manifold.

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25051-28180 SAYS THIS IS THE ONE OFF OF VIN FOR CALIFORNIA EMISSIONS