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Grand Cherokee WJ oxygen sensor

An O2 sensor is a galvanic battery that provides the PCM with a voltage signal (0-1 volt) inversely proportional come the quantity of oxygen in the exhaust. In various other words, if the oxygen content is low, the voltage calculation is high; if the oxygen content is high the calculation voltage is low. The PCM offers this information to adjust injector pulse-width to achieve the 14.7–to–1 air/fuel ratio crucial for ideal 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 because that comparison. Present O2 sensors get their fresh oxygen (outside air) supply v the O2 sensor situation housing.

Four wires (circuits) are provided on every O2 sensor:

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

The Oxygen Sensors (O2S) are attached to, and also protrude into the vehicle exhaust system. Relying on the emission package, the car may use a complete of either 2 or 4 sensors.

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

Two sensors room used: upstream (referred to together 1/1) and downstream (referred to together 1/2). Through this emissions package, the upstream sensor (1/1) is located just prior to the key catalytic convertor. The downstream sensor (1/2) is located simply after the key catalytic convertor.

California Emissions package (4.0L engine):

On this emissions package, 4 sensors room used: 2 upstream (referred to together 1/1 and also 2/1) and 2 downstream (referred to together 1/2 and also 2/2). V this emissions package, the rear/upper upstream sensor (2/1) is situated in the exhaust downpipe just before the rear mini-catalytic convertor. The front/upper upstream sensor (1/1) is located in the exhaust downpipe just prior to the front mini-catalytic convertor. The rear/lower downstream sensor (2/2) is located in the exhaust downpipe simply after the rear mini-catalytic convertor, and also before the key catalytic convertor. The front/lower downstream sensor (1/2) is located in the exhaust downpipe simply after the front mini-catalytic convertor, and also before the key catalytic convertor.

California Emissions package (4.7L engine):

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

02S Sensor removal

Never use any type of grease come the oxygen sensor electrical connector, or attempt any soldering that the sensor wiring harness.

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

1. Raise and also support vehicle.

2. Disconnect O2S pigtail harness from key wiring harness.

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

CAUTION: as soon as disconnecting sensor electrical connector, execute not pull directly on wire going into sensor.

4. Remove O2S sensor v an oxygen sensor removal and also installation tool.

02S Sensor installation

Threads of new oxygen sensors are factory coated with anti-seize compound to aid in removal. Do NOT add any extr anti-seize link to threads of a brand-new oxygen sensor.

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

2. Connect O2S sensor wire connector to main wiring harness.

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3. If equipped, affix sensor wire harness mounting clips come engine or body. Once Equipped: The O2S pigtail harness should be clipped and/or bolted earlier to their initial positions on engine or body to avoid mechanical damages to wiring.

Grand Cherokee WJ oxygen sensors

(Part Numbers: Black text = commonwealth emissions, black + 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