How to Locate & Install the Oxygen Sensor on a 1996 Dodge Ram 1500

Robert Bosch introduced the oxygen sensor to the automotive industry in 1976. At the time, Bosch used the sensor to test the gases emitted by batteries. The tightening of emission standards for automobiles brought about a need to test the oxygen content in the exhaust. This is a direct indication as to the amount of unburned fuel or emissions. The oxygen sensor generates electrical energy when it is hot and encounters oxygen. Too much oxygen produces a high voltage indicating a lean mixture. Too little oxygen indicates a rich mixture. The only accurate way to check the operation of the oxygen sensor is with a code scanner. Purchase an inexpensive one at most auto parts stores.

Instructions

1

Plug the code scanner into the onboard diagnostic port located under the dash just to the left of the steering column. Turn the ignition key on without starting the engine. Press the "Read" button and the scanner will interface with the computer and withdraw all the fault codes, if any.

2

Check and make note of the displayed codes. They will be presented as a letter followed by four numbers. Cross-reference these codes with the code sheet for an explanation of the fault. An oxygen sensor code will be displayed as follows: O2 (oxygen sensor) B1 (bank one, relevant if there is more than one sensor) S1 or S2 (sensor one or two, the second always located behind the converter). The explanation of the fault will follow the code.

3

Read and interpret the codes. If the code states that the signal from the sensor has been lost or the oxygen sensor preheater has malfunctioned, replace the sensor. If the code states the sensor signal is too low or high, it means the fuel mixture is irregular. This is the tricky part. This does not necessarily mean the sensor is bad, it just means the computer has sensed the wrong signal and turned the check engine light on. Causes of this signal include a tune-up problem, spark plugs, wires, injectors and more. Check the engine tune before condemning the sensor.

4

Raise the front of the Dodge truck with the floor jack and place jack stands under the frame. Lower the truck onto the stands. Locate the sensor on the passenger-side exhaust manifold on the V-6. The V-8 engines have the sensor mounted in the exhaust pipe just ahead of the "Y" were the two manifold pipes intersect.

5

Unplug the sensor harness plug by simply pulling the connectors apart. Turn the sensor counterclockwise with the 7/8-inch wrench to remove it.

6

Install the new sensor by threading it in clockwise by hand, then tightening it with the wrench. Plug the sensor harness into the vehicle harness.

7

Raise the truck and remove the jack stands. Lower the truck. Turn the ignition key on again and press the "Erase" button. This erases all codes, the check engine light turns off and the computer reset until the next code. Remove the code scanner.