Left catalytic converter 4.4L (Discovery 3)

Special tool

Heated Oxygen 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 only by a jack. Always support the vehicle with special stands.

Raise and support the vehicle.

3. Remove the exhaust system. For more information, refer to Exhaust System (10/30/08)

4. Remove the catalytic converter. Loosen the nut and loosen the clamp.

5.

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

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

Installation

1.

CAUTION: Avoid contact of anti-seize compound with the tip of the heated oxygen sensor.

Using the special tool, install the heated oxygen sensor onto the catalytic converter and tighten. (tightening torque 45 Nm).

• Clean the parts.
• Apply anti-seize compound to the threaded portion of the heated oxygen sensor.

2.

NOTE: Do not tighten the clamp at this stage.

Connect the catalytic converter to the front muffler.

• Clean the parts.
• Screw on the nut.

3. Install the exhaust system. For more information, refer to Exhaust System (10/30/08)

4. Tighten the catalytic converter clamp. (tightening torque 55 Nm).

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