The engine computer system references the oxygen sensors to determine how much oxygen is in the exhaust contrasted to the amount of oxygen in the atmosphere. The sensor voltage is developed by chemical reactions that the computer system uses to determine the correct amount of fuel to it is in injected right into the engine. Oxygen sensors have the right to fail together the mile pass, due to carbon buildup and break down of the inner parts from warmth cycles.

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This article applies to the evade Ram 3rd Generation (2002-2008).

The third generation Dodge lamb uses four oxygen sensors: 2 in former of the catalytic converters and also two after. The ECU recommendations the front 2 sensors because that fuel control. The behind oxygen sensors are used to screen the effectiveness of the converters mainly for emissions purposes. The sensors are typically identified by the surname Sensor 1 bank 1 or Sensor 2 bank 2. This numbers exchange mail to i beg your pardon exhaust pipeline the sensor is located on, and also where the sensor is located in relation to the exhaust manifolds.

Oxygen sensors encompass many dedicated working parts that create the reaction to generate its very own voltage. Some factors you might be seeing an oxygen sensor connected code are extreme carbon buildup top top the sensor, damaged ceramic coatings or zirconium elements, and also electrode failures. Shorts, opens, and high-resistance in the circuits" wiring can likewise cause a non-functioning sensor or a sensor v erratic readings.

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

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

Step 1 – Raise and support front of the truck

First, set the parking brake. Using your floor jack, raise every side the the truck and place jack was standing under the framework rails. A block that wood can be placed between the structure rails and also jack stands to minimization the possibility of damage arising from the pointed areas of the stands.

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Figure 1. Place jack stands on the framework rails.

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Step 2 – Disconnect electric connectors native oxygen sensors

Once you room under the vehicle, apply some penetrating liquid where the sensor meets the exhaust. The dirtier your truck is, the greater the possibility your sensor may be seized top top the pipe.

Follow the wiring increase from which ever before sensor you space replacing. Girlfriend will discover where the connectors meet. If friend can"t reach the connectors, girlfriend will need to remove the wiring from any kind of clips or press pins that organize the wiring in place. Seize the connector and also lift increase on the locking tab situated on the sensor next while pulling them apart.

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Figure 2. The locations of the 4 oxygen sensors.
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Figure 3. The red arrowhead points to the locking tab.

Step 3 – eliminate oxygen sensor(s)

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

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Figure 4. A closer photo of an oxygen sensor.

Step 4 – Install brand-new sensor(s)

The new sensors may have actually a plastic lid over the threads that needs to be removed. If over there is no anti-seize ~ above the threads, use a tiny amount. Start the oxygen sensor through hand, and also then speak the sensor to 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 ago up and also remove the jack stands. Utilizing a scan tool, erase the system trouble codes. If you perform not have a scan tool, driving for 10 come 20 miles may erase the code.