Unattached wire there are two wires in the harness one goes to the o2 sensor the other has a female post clip do you know were it goes

posted 3 times now and forget to say FRONT SENSOR>
right, not the Rear 02 sensor....?
and still no engine stated.!
nor country, (USA calif, usa FED, or canada)
strike three you are out.
sorry.
there are 3 engines,
based on all 3 engine schematics, my wild guess
is 7AFE engine. (the brown wire clue) 1,8L
4AFE (1.6L)
or 1ZZFE engine, DOHC 1.8L

posted now 3 times.
no engine stated (of the 3)
no symptoms stated. or job.
front or rear , oBD2 sensor not stated.
on your other post, i answred for all 3 engine
front 02 sensor B1S1.
all 3 engines, the ECU schematics on the 02 pins.

go back and read. your other posts.

with the O2 connected on a 3 wire sensor you should have a ground a battery supply and a ecm voltage of 4.5.with it running the sensor voltage(4.5) should fluctuate above and below the 4.5 volts when its in closed loop. if you don`t have one or any of these voltages then you will need to check from the connector back to where the voltages/ground is supplied, which is the ecm.

Its possible that plug is for an option that you particular model doesn't have, lets say a downstream O2 sensor(after cat).

It is a single wire coming out of the harness that goes across the cylinders 2,4 and 6, about center of the vehicle. You probably need to use a mirror to be able to see it since is hanging down behind the engine. I hope this helps.

Likely the wires tore out of the connector. That should be somewhere in front of the sensor, attached to the floor board. New sensors are sold with and without the connector attached. Best to buy one pre-built to avoid getting the wires in the wrong positions (only a few $ more than "universal" type). When installing, route the wiring away from the exhaust and make sure it does not hang down.
Once installed, check the fuses in the power distribution center and make sure none are blown. (can happen if one of the wires shorted when they pulled out).

CausesPotential causes of an P0160 code include:

• Holes in exhaust near post cat o2 sensor
• Bad Bank 2, position 2, o2 sensor
• Wiring problem, melted harness, broken connectors, etc.
• Bad PCM

Possible SolutionsIt's always best to do a visual inspection of the exhaust system first. Look for holes near o2 sensors or wiring harnesses coming in contact with exhaust components. Repair as necessary.
1. Start the engine and allow it to reach operating temperature. Using a scan tool, observe the Bank 2 position 2 o2 sensor. If it isn't moving at all this doesn't necessarily mean that anythings wrong. Post cat o2 sensors often switch very little. Increase the engine RPM to a fast idle and then recheck the sensor voltage reading. If it starts switching now, the sensor may be sluggish and/or intermittently going "dormant". Replacing the sensor at this point would be a good idea. Visually check the o2 sensor for contaminates, etc. If you suspect it's contaminated with coolant or oil, replace it. But, if it still isn't responding after increasing engine RPM, turn off the engine and unplug the 2/2 o2 sensor. With KOEO (key on engine off) check that there is 12 Volts battery voltage and a good ground to the o2 sensor heater element. If the heater element has no battery voltage it can cause the o2 sensor to be sluggish and not switch properly which can cause a P0160.
So, diagnose that problem first(there will usually be other codes present). If there is power and ground to the heater element check that the sensor ground is present. If it is, connect a jumper wire between the sensor ground and signal wire. Now the 2/2 o2 sensor reading should be low. If so, replace the Bank 2 position 2 o2 sensor. If, after connecting the jumper wire, the o2 sensor reading still remains "stuck", check for wiring problems, harness contacting exhaust components, or broken connectors. Repair as necessary. Then recheck. If you can find no wiring problems and the o2 sensor reading on the scan tool doesn't change after installing the jumper wire, recheck at the PCM connector. It may be necessary to clip the signal wire near the PCM in a location that will be easy to repair. If it now shows a low voltage reading, then you know beyond a doubt that there is a wiring problem. At this point clipping the offending wire out of the harness and running a new one may be your best bet. But If it still shows no change, the PCM may be at fault.

Grand Cherokee oxygen sensor locations for 4.0 and 4.7 engines







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

• 12–volt feed circuit for the sensor heating element
• Ground circuit for the heater element
• Low-noise sensor return circuit to the PCM
• Input circuit from the sensor back to the PCM to detect sensor operation

O2S Sensor removal Never apply any type of grease to the oxygen sensor electrical connector, or attempt any soldering of the sensor wiring harness.
WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES AND CATALYTIC CONVERTER(S) BECOME VERY HOT DURING ENGINE OPERATION. ALLOW ENGINE TO COOL BEFORE REMOVING OXYGEN SENSOR.
1. Raise and support vehicle.
2. Disconnect O2S pigtail harness from main wiring harness.
3. If equipped, disconnect sensor wire harness mounting clips from engine or body.
CAUTION: When disconnecting sensor electrical connector, do not pull directly 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 factory coated with anti-seize compound to aid in removal. DO NOT add any additional anti-seize compound to threads of a new oxygen sensor.
1. Install O2S sensor. Tighten to 22 ft. lbs. (30 N·m) torque.
2. Connect O2S sensor wire connector to main wiring harness.
3. If equipped, connect sensor wire harness mounting clips to engine or body. When Equipped: The O2S pigtail harness must be clipped and/or bolted back to their original positions on engine or body to prevent mechanical damage to wiring.


Hope thats help (remember comment and rated this).

The O2 sensor after the Catalytic converter has gone bad or the converter it self. Lets start with the simple and replace the cheaper of the two but before you do that, check the wire harness where the O2 sensor clips on to the wire harness at the frame. Look for any damage to the clip such as corrosion or broken wire. Good luck and hope this helps.

Hi,

To my knowledge, the Lambda Sensor (also known as O2, Direct-Fit Oxygen or HEGO sensor) is threaded through the exhaust manifold as shown below.
It would have 4 wires - 1 black, one gray and two whites. Depending on the country of manufacture, above the exhaust around the wiring harness there may be a male connector its white or green connector with 4 pins, at the end of the O2 there suppose to be a female connector on it which is white or green or black/yellow wire, purple/white wire, brown wire and a white wire. It would look something like this

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

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