The engine computer references the oxygen sensors come determine just how much oxygen is in the exhaust compared to the lot of oxygen in the atmosphere. The sensor voltage is created by chemistry reactions the the computer system uses to identify the exactly amount the fuel to be injected right into the engine. Oxygen sensors have the right to fail together the miles pass, because of carbon buildup and breakdown of the inner parts from heat cycles.

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This article applies to the dodge Ram third Generation (2002-2008).

The third generation Dodge ram uses 4 oxygen sensors: 2 in prior of the catalytic converters and also two after. The ECU references the front two sensors for fuel control. The rear oxygen sensors are supplied to monitor the effectiveness of the converters mainly for emissions purposes. The sensors are generally identified by the names Sensor 1 financial institution 1 or Sensor 2 bank 2. These numbers correspond to which exhaust pipe the sensor is located on, and where the sensor is situated in relation to the exhaust manifolds.

Oxygen sensors incorporate many specialized working components that produce the reaction to generate its own voltage. Some reasons you might be seeing an oxygen sensor associated code are extreme carbon buildup on the sensor, damaged ceramic coatings or zirconium elements, and also electrode failures. Shorts, opens, and also high-resistance in the circuits" wiring can likewise cause a non-functioning sensor or a sensor v erratic readings.


Materials Needed22mm box-end wrenchFloor jackJack was standing (2)Block of hardwood (optional)Penetrating fluidAnti-seizeScan tool (optional)

It"s recommended actual Mopar oxygen sensors are offered for finest results. The component numbers are 56041698AA because that the upstream sensors and also 56041706AA for the downstream. These component numbers use to the 5.7 liter hemi engine.

Step 1 – Raise and support former of the truck

First, set the parking brake. Using your floor jack, raise every side the the truck and also place jack stand under the frame rails. A block that wood have the right to be placed in between the framework rails and jack stand to minimize the opportunity of damage arising from the pointed locations of the stands.

Figure 1. Placing jack stands on the frame rails.

(Related Article: exactly how to Jack Up your Truck -

Step 2 – Disconnect electric connectors indigenous oxygen sensors

Once you room under the vehicle, use some penetrating liquid where the sensor meets the exhaust. The dirtier her truck is, the higher the chance your sensor may be seized ~ above the pipe.

Follow the wiring up from which ever before sensor you space replacing. Girlfriend will find where the connectors meet. If girlfriend can"t with the connectors, you will have to remove the wiring from any type of clips or press pins that host the wiring in place. Take the connector and also lift increase on the locking tab located on the sensor side while pulling castle apart.

Figure 2. The places of the four oxygen sensors.
Figure 3. The red arrowhead points come the locking tab.

Step 3 – eliminate oxygen sensor(s)

If you room sure you will not be utilizing the sensor again, friend can reduced the connector plug off and also slide a 22mm box-end wrench top top the sensor. Otherwise, girlfriend will need the proper oxygen sensor socket. It will take some force to rest the sensor loose. Rotate the sensor in a counterclockwise direction.

Figure 4. A closer picture of one oxygen sensor.

Step 4 – Install brand-new sensor(s)

The brand-new sensors may have a plastic lid over the object that requirements to be removed. If there is no anti-seize ~ above the threads, apply a small amount. Start the oxygen sensor through hand, and then speak the sensor come 22 ft./lb. Make certain the wiring is routed correctly when the connectors space plugged together.

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Step 5 – finish the installation

Raise the truck earlier up and also remove the jack stands. Making use of a scan tool, erase the device trouble codes. If you carry out not have a scan tool, driving because that 10 to 20 miles may erase the code.