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Grand Cherokee WJ oxygen sensor
An O2 sensor is a galvanic battery that gives the PCM through a voltage signal (0-1 volt) inversely proportional come the amount of oxygen in the exhaust. In other words, if the oxygen content is low, the voltage calculation is high; if the oxygen contents is high the output voltage is low. The PCM offers this information to adjust injector pulse-width to attain the 14.7–to–1 air/fuel ratio crucial for appropriate engine operation and also to control emissions.
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The O2 sensor must have a resource of oxygen from external of the exhaust stream because that comparison. Current O2 sensors receive their new oxygen (outside air) supply v the O2 sensor situation housing.
Four wires (circuits) are provided on each O2 sensor:
12–volt feeding circuit because that the sensor heating elementGround circuit because that the heater elementLow-noise sensor return circuit come the PCMInput circuit native the sensor earlier to the PCM to detect sensor operation
Grand Cherokee oxygen sensor locations for 4.0 and 4.7 engines
The Oxygen Sensors (O2S) room attached to, and also protrude right into the auto exhaust system. Relying on the emission package, the vehicle may usage a complete of one of two people 2 or 4 sensors.
Federal Emissions parcel (4.0L and also 4.7L engines):
Two sensors are used: upstream (referred to together 1/1) and downstream (referred to as 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 parcel (4.0L engine):
On this emissions package, 4 sensors space used: 2 upstream (referred to together 1/1 and 2/1) and also 2 downstream (referred to as 1/2 and also 2/2). With this emission package, the rear/upper upstream sensor (2/1) is situated in the exhaust downpipe just before the behind mini-catalytic convertor. The front/upper upstream sensor (1/1) is situated in the exhaust downpipe just before the former mini-catalytic convertor. The rear/lower downstream sensor (2/2) is situated 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 located in the exhaust downpipe simply after the prior mini-catalytic convertor, and also before the main catalytic convertor.
California Emissions parcel (4.7L engine):
On this emissions package, 4 sensors are used: 2 upstream (referred to together 1/1 and 2/1) and also 2 downstream (referred to together 1/2 and also 2/2). With this emission package, the right upstream sensor (2/1) is situated in the appropriate exhaust downpipe just before the mini-catalytic convertor. The left upstream sensor (1/1) is situated in the left exhaust downpipe just prior to the mini-catalytic convertor. The ideal downstream sensor (2/2) is situated in the appropriate 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 just after the mini-catalytic convertor, and also before the main catalytic convertor
02S Sensor removal
Never use any kind of grease to the oxygen sensor electric connector, or attempt any kind of soldering the the sensor wiring harness.
WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES and also CATALYTIC CONVERTER(S) BECOME really HOT throughout ENGINE OPERATION. Permit ENGINE to COOL prior to REMOVING OXYGEN SENSOR.
1. Raise and support vehicle.
2. Disconnect O2S pigtail harness from key wiring harness.
3. If equipped, disconnect sensor cable harness mounting clips native engine or body.
CAUTION: when disconnecting sensor electrical connector, perform not pull straight on wire going into sensor.
4. Remove O2S sensor with an oxygen sensor removal and installation tool.
02S Sensor installation
Threads of new oxygen sensors are manufacturing facility coated v anti-seize link to help in removal. Perform NOT include any added anti-seize compound to object of a new oxygen sensor.
1. Install O2S sensor. Tighten come 22 ft. Lbs. (30 N·m) torque.
2. Attach O2S sensor cable connector to key wiring harness.
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3. If equipped, connect sensor wire harness mounting clips to engine or body. Once Equipped: The O2S pigtail harness should be clipped and/or bolted back to their original positions on engine or body to prevent mechanical damages to wiring.
Grand Cherokee WJ oxygen sensors(Part Numbers: Black message = federal emissions, black + red text = California emissions) | ||
| Engine | Before catalyst | After catalyst |
1999-2000 | ||
| 4.0L | 56041676AA(w/10.5″ pigtail)56041212AE(w/18″ pigtail) | 56041344AD(w/14″ pigtail)56041212AF(w/12″ pigtail) |
| 4.7L | 56028233AA(w/12″ pigtail)56028232AA(w/18″ pigtail) | 56041345AD(w/14″ pigtail)56028235AA(w/12″ pigtail) |
2001-2003 | ||
| 4.0L | 56041943AA56041944AA | 56041845AB5139020AA |
| 4.7L | 56029333AA56041941AA | 56041345AE56041731AA |
2004 | ||
| 4.0L | 56028995AA56028994AA | 56028997AA05139021AA |
| 4.7L | 56044580AA56044581AA | 56044582AA56044583AA |