Welcome to the bsci-ch.org thorough page on WJ Generation Jeep cool Cherokee oxygen sensors. We have actually organized together much info as we can find right into a helpful short article below. Is something incorrect or missing? Please get in touch with us and we’ll fix it!

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Grand Cherokee WJ oxygen sensor

An O2 sensor is a galvanic battery that gives the PCM with a voltage signal (0-1 volt) inversely proportional to the amount of oxygen in the exhaust. In other words, if the oxygen contents is low, the voltage output is high; if the oxygen contents is high the output voltage is low. The PCM uses this details to adjust injector pulse-width to achieve the 14.7–to–1 air/fuel ratio crucial for proper engine operation and to regulate emissions.

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The O2 sensor must have a resource of oxygen from exterior of the exhaust stream for comparison. Existing O2 sensors obtain their new oxygen (outside air) supply with the O2 sensor instance housing.

Four wires (circuits) are supplied on each O2 sensor:

12–volt feed circuit for the sensor heating elementGround circuit because that the heater elementLow-noise sensor return circuit to the PCMInput circuit indigenous the sensor back to the PCM come detect sensor operation
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Grand Cherokee oxygen sensor locations for 4.0 and also 4.7 engines

The Oxygen Sensors (O2S) space attached to, and also protrude into the vehicle exhaust system. Depending upon the emission package, the auto may use a full of either 2 or 4 sensors.

Federal Emissions package (4.0L and 4.7L engines):

Two sensors room used: upstream (referred to as 1/1) and downstream (referred to as 1/2). V this emissions package, the upstream sensor (1/1) is located just before the main catalytic convertor. The downstream sensor (1/2) is located just after the key catalytic convertor.

California Emissions package (4.0L engine):

On this emissions package, 4 sensors space used: 2 upstream (referred to as 1/1 and also 2/1) and 2 downstream (referred to as 1/2 and 2/2). With this emissions package, the rear/upper upstream sensor (2/1) is located in the exhaust downpipe just prior to the behind mini-catalytic convertor. The front/upper upstream sensor (1/1) is located in the exhaust downpipe just prior to the prior mini-catalytic convertor. The rear/lower downstream sensor (2/2) is located in the exhaust downpipe just after the behind mini-catalytic convertor, and before the main catalytic convertor. The front/lower downstream sensor (1/2) is situated in the exhaust downpipe just after the former mini-catalytic convertor, and before the main catalytic convertor.

California Emissions package (4.7L engine):

On this emissions package, 4 sensors are used: 2 upstream (referred to as 1/1 and 2/1) and also 2 downstream (referred to as 1/2 and also 2/2). With this emissions package, the appropriate upstream sensor (2/1) is located in the best exhaust downpipe just before the mini-catalytic convertor. The left upstream sensor (1/1) is located in the left exhaust downpipe just before the mini-catalytic convertor. The best downstream sensor (2/2) is located in the right exhaust downpipe simply after the mini-catalytic convertor, and before the key catalytic convertor. The left downstream sensor (1/2) is situated in the left exhaust downpipe simply after the mini-catalytic convertor, and also before the main catalytic convertor

02S Sensor removal

Never apply any form of grease to the oxygen sensor electric connector, or attempt any soldering of the sensor wiring harness.

WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES and CATALYTIC CONVERTER(S) BECOME really HOT throughout ENGINE OPERATION. Allow ENGINE to COOL prior to REMOVING OXYGEN SENSOR.

1. Raise and support vehicle.

2. Disconnect O2S pigtail exploit from main wiring harness.

3. If equipped, disconnect sensor cable harness mounting clips native engine or body.

CAUTION: once disconnecting sensor electric connector, do not pull directly on wire going into sensor.

4. Eliminate O2S sensor v an oxygen sensor removal and installation tool.

02S Sensor installation

Threads of brand-new oxygen sensors are factory coated v anti-seize compound to help in removal. Carry out NOT include any extr anti-seize compound to object of a brand-new oxygen sensor.

1. Install O2S sensor. Tighten come 22 ft. Lbs. (30 N·m) torque.

2. Connect O2S sensor cable connector to key wiring harness.

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3. If equipped, connect sensor cable harness mounting clips come engine or body. As soon as Equipped: The O2S pigtail harness need to be clipped and/or bolted earlier to their original positions top top engine or body to protect against mechanical damages to wiring.

Grand Cherokee WJ oxygen sensors

(Part Numbers: Black text = commonwealth emissions, black color + red text = California emissions)

EngineBefore catalystAfter catalyst

1999-2000

4.0L56041676AA(w/10.5″ pigtail)56041212AE(w/18″ pigtail)56041344AD(w/14″ pigtail)56041212AF(w/12″ pigtail)
4.7L56028233AA(w/12″ pigtail)56028232AA(w/18″ pigtail) 56041345AD(w/14″ pigtail)56028235AA(w/12″ pigtail)

2001-2003

4.0L56041943AA56041944AA56041845AB5139020AA
4.7L56029333AA56041941AA56041345AE56041731AA

2004

4.0L56028995AA56028994AA56028997AA05139021AA
4.7L56044580AA56044581AA56044582AA56044583AA