Saturn 22970505 3Way Catalytic Convertor Assembly (W/Exhaust Manifold Pip

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To remove the catalytic converter, open the hood and spray the upper exhaust pipe-to-exhaust manifold flange nuts with penetrating oil. Let it sit and remove the nuts. Raise the vehicle and support it on jackstands. Disconnect the downstream oxygen sensor and, if applicable, the upstream sensor if it is installed in the exhaust pipe rather than the manifold. Remove the two bolts/nuts that attach the exhaust pipe behind the catalytic converter to the resonator pipe flange. Finally, remove the catalytic converter and discard the old flange gaskets.

Start by opening the hood and spraying the upper exhaust pipe-to-exhaust manifold flange nuts with penetrating oil. Let it sit for a while and then remove the nuts.

To install the new catalytic converter, follow the reverse steps of removal. Make sure to use new gaskets at both mounting flanges and new nuts at the front flange and new bolts at the rear flange.