Selective Catalytic Reduction System Catalyst: Removal

WARNING: This page is about a different variant/trim than selected.

NOTE: Do not use silicone based sprays or lubricants on any components installed onto or around the diesel exhaust system or intake air distribution and filtering system. Silicone reacts with the Nitrogen Oxides (NOx) sensors and may cause permanent damage to the NOx sensors.

NOTE: The selective catalytic reduction system catalyst has a diesel exhaust fluid (DEF) injector that adds DEF to the selective catalytic reduction system catalyst which helps clean the exhaust system emissions.

NOTE: If the selective catalytic reduction system catalyst is not being replaced, the diesel exhaust fluid injector electrical connector and pressure line connector, the exhaust gas temperature sensor and the NOX sensor do not need to be removed from the selective catalytic reduction system catalyst. Disconnecting the electrical connectors and the diesel exhaust fluid injector pressure line connector is still necessary.

NOTE: Removal steps in this procedure may contain installation details.

NOTE: Clean all exhaust connections before reassembly.

Position vehicle on a hoist. Refer to: Jacking and Lifting - Overview .
Position back the protective cover and disconnect the diesel exhaust fluid injector pressure line connector.

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Position back the protective cover and disconnect the diesel exhaust fluid injector electrical connector and wire retainer.

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Disconnect the exhaust gas temperature sensor wiring connector and wiring retainer.

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Disconnect the NOX sensor electrical connector and wiring retainer.

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Remove the bolts from the selective catalytic reduction system catalyst to the muffler.
Torque: 30 lb.ft (40 Nm)

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Remove and discard the fasteners.
Torque: 30 lb.ft (40 Nm)

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Remove the heat shield and discard the gasket.

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Remove the front exhaust hanger bracket bolts.
Torque: 18 lb.ft (25 Nm)

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Remove the rear exhaust hanger bracket bolts and the remove the selective catalytic reduction system catalyst.
Torque: 18 lb.ft (25 Nm)

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