300, Magnum, 2005

Heated Oxygen Sensor

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Removal & Installation



2.7L, 3.5L, 5.7L & 6.1L

The engines uses two heated oxygen sensors, one in each exhaust manifold.


WARNING
Never apply any type of grease to the oxygen sensor electrical connector, or attempt any soldering of the sensor wiring harness.


CAUTION
THE EXHAUST MANIFOLD, EXHAUST PIPES AND CATALYTIC CONVERTER BECOME VERY HOT DURING ENGINE Operation. ALLOW ENGINE TO COOL BEFORE REMOVING OXYGEN SENSOR.


WARNING
When disconnecting sensor electrical connector, do not pull directly on wire going into sensor.

  1. Remove the negative battery cable.
  2.  
  3. Raise vehicle and support.
  4.  
  5. Disconnect the heated oxygen sensor electrical connector.
  6.  
  7. Use a suitable socket or a crowfoot wrench to remove oxygen sensor.
  8.  

To install:


NOTE
When replacing an O2 Sensor, the PCM RAM memory must be cleared, either by disconnecting the PCM C-1 connector or momentarily disconnecting the Battery negative terminal. The NGC learns the characteristics of each O2 heater element and these old values should be cleared when installing a new O2 sensor. The customer may experience driveability issues if this is not performed.


WARNING
Never apply any type of grease to the oxygen sensor electrical connector, or attempt any soldering of the sensor wiring harness.

After removing the sensor, the exhaust manifold threads must be cleaned with an 18 mm X 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite 771- 64 or equivalent. New sensors have compound on the threads and do not require an additional coating.

  1. Tighten the sensor to 28 Nm (20 ft. lbs.) torque on 2.7L and 3.5L engines, and to 30 Nm (22 ft. lbs.) torque on 5.7L and 6.1L engines.
  2.  
  3. Connect the heated oxygen sensor electrical connector.
  4.  
  5. Lower vehicle. Install the negative battery cable.

    Click image to see an enlarged view

    Fig.

  6.  

 
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