Right catalytic converter 4.0L (Discovery 3)

Special tool

HO2S Sensor Key 310-121 (LRT-19-014)

Removal

1. Disconnect the ground cable from the battery. For more information, refer to Specification.

2.

CAUTION: Never work on a vehicle supported solely by a jack. Always support the vehicle securely.

Raise and support the vehicle.

3. Remove the transmission crossmember. For more information, refer to Transmission Support Crossmember (76.10.09 or 76.10.92)

4. Release the right rear HO2S wiring harness. Disconnect the electrical connector.



5. Disconnect the catalytic converter from the exhaust manifold. Remove and discard the 2 bolts.



6. Remove the catalytic converter.

• Unscrew 2 nuts.
• Discard the gasket.

7.

NOTE: Do not perform further disassembly if the component is removed only for access.

Using the special tool, remove both HO2S sensors from the catalytic converter.

Installation

1.

CAUTION: Avoid getting grease on the tip of the HO2S sensor.

Using the special tool, install the HO2S sensor to the catalytic converter and tighten to 45 Nm.

• Clear the elements.
• Apply grease to the HO2S sensor threads.

2. Connect the catalytic converter to the front muffler.

• Clear the elements.
• Install a new gasket.
• Tighten the nuts to 55 Nm.

3. Connect the catalytic converter to the exhaust manifold.

• Clear the elements.
• Tighten the new bolts to 22 Nm.

4. Install the transmission crossmember. For more information, refer to Transmission Support Crossmember (76.10.09 or 76.10.92)

5.

CAUTION: Ensure that the heated oxygen sensor wiring harness does not have bends greater than 180 degrees and does not touch the exhaust manifold or propeller shaft.

Connect the HO2S sensor electrical connectors. Secure the HO2S sensor wiring harness.

6. Connect the ground cable to the battery. For more information, refer to Specification.