RAM 3500 Truck 4WD V10-8.0L VIN W HDC (1999)
Oxygen Sensor: Service and Repair
Pre-Catalyst/Post Catalyst Oxygen Sensor Location
On 8.0L MDC engines, the pre-catalyst and post catalyst O2S sensors are located at the inlet and out- let ends of the catalytic converter.
Left/Right Oxygen Sensor Location
On 8.0L MDC or HDC engines, the left and right O2S sensors are located on the left and right exhaust downpipes.
REMOVAL
WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES AND CATALYTIC CONVERTER BECOME VERY HOT DURING
ENGINE OPERATION. ALLOW ENGINE TO COOL BEFORE REMOVING OXYGEN SENSOR.
1. Raise and support the vehicle.
2. Disconnect the wire connector from the O2S sensor.
CAUTION: When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
3. Remove the O2S sensor. Snap-On oxygen sensor wrench (number YA 8875) may be used for removal and installation.
INSTALLATION
Threads of new oxygen sensors are factory coated with anti-seize compound to aid in removal. DO NOT add any additional anti-seize compound to
the threads of a new oxygen sensor.
1. Install the O2S sensor. Tighten to 30 Nm (22 ft. lbs.) torque.
2. Connect the O2S sensor wire connector.
3. Lower the vehicle.
