Left Heated Oxygen Sensor (HO2S) 4.0L (Discovery 3)

Special tool

Key for heated oxygen sensor 310-121 (LRT-19-014)

Removing

1.

WARNING: It is forbidden to carry out work on a vehicle supported only by a jack. Always place secure supports under the vehicle.

Raise and support the vehicle.

2. Disconnect the left catalytic converter from a final collector. Loosen and discard two bolts.



3. Disconnect the right catalytic converter from a final collector. Loosen and discard two bolts.



4. Using the special tool, remove the HO2S.

• Release the wiring harness.
• Disconnect the electrical connector.

Installation

1.

CAUTION: Be careful not to get grease on the tip of the HO2S.

CAUTION: Make sure the heated oxygen sensor harness is not bent more than 180 degrees and is not touching the exhaust manifold or driveshaft.

Using the special tool, install the heated oxygen sensor.

• Clear the elements.
• Apply an anti-seize compound to the heated oxygen sensor threads.
• Tighten the heated oxygen sensor to 45 Nm.
• Connect the electrical connector.
• Connect the wiring harness.

2. Connect the right catalytic converter to the exhaust manifold.

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

3.

WARNING: Make sure that the distance (A) between the nearest surfaces of the left catalytic converter and the front propeller shaft is 25-30 mm.

Connect the left catalytic converter to the exhaust manifold.

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