Oxygen Sensors

On the exhaust manifold near the headpipe connection or on the headpipe near the exhaust manifold.

AnswerThere are 4 oxygen sensors (o2 sensors)and they are all located on the exhaust coming from the motor under the vehicle by the catylac converters. AnswerO2 sensors are on the exaust manifold under the vehicle AnswerThere are 4 sensors, though not all of them are technically called "oxygen sensors. There are two that are upstream of the catalytic converters, one on each bank. Then, there are two more, one after each catalytic converter, that are oxygen sensors, but officially they are called catalyst monitors, because that is the job they are assigned to do.

To recap, the two before the cats (or upstream), are oxygen sensors, and the two after the cats (or downstream) are catalyst moniters. Although all 4 of them are oxygen sensors, their titles are different.

AnswerThere are 2 locations: one in between the catalytic converter and the manifold, the other is after the catalytic converter. The number of sensors varies with the engine type. The 4.0L v6 OHV has one sensor in each location, the 4.0L v6 SOHC has two sensors on the manifold side. AnswerWell, with my 4.0L SOHC motor, there are FOUR O2 Sensors, two aft and two forward of the catalytic convertor. The two forward ones are rather hard to access, but the two aft ones (located just to the right of the transfer case) are somewhat easier. They almost look like a spark plug with a wire and a clip coming out the back. AnswerDepending on the year, Ford Explorers may have one, two, or four Oxygen sensors (O2S). Earlier models have only one upstream sensor in the common exhaust header. Later models either have one upstream and one downstream (past the catalytic converter), or two upstream and two downstream sensors. It should be noted that although all of the sensors signals are monitored, it is the upstream sensors that affect the PCM.

It is far easier to do this on a lift and with small hands.

Simply access the sensors from under the vehicle. Detach the wiring harness. Using the appropraite sized wrench, unscrew the sensor. Reverse the process to reinstall.

Hint: A small pointed tool may help reach the passenger side upper most sensor wire harness.

AnswerThey are screwed into the exaust system at various points. Some people say that there are 4 oxygen sensors, but technically,that is not correct. Only the front 2 are considered oxygen sensors. They are screwed into the exaust pipe, one on each bank,after the exaust manifold, but before the catalytic converter. Sometimes they are screwed directly into the exaust manfold itself. The other 2 are actually called catalyst moniters. They are oxygen sensors, but they serve a different purpose. They moniter the activities of the catalytic converters, thus the name, catalyst moniters. They are screwed into the exaustone on each bank,after, or downstream, of the catalytic converters.

There is only 1 Oxygen (02) sensor on a 1991 vehicle. Beginning in 1996 (and some late 1995's), with the new OBDII system there were 2 sensors installed, 1 in front of the catalytic convertor and 1 behind the convertor.

Replacing 1996 Explorer oxygen sensorsThe oxygen (O2) sensors are located in the exhaust system. There are three sensors, one in each of the exhaust headers near each of the front wheels and the third in the common exhaust pipe further back. A special deep socket is available from any parts store to remove the sensors. The socket has a slit down its length to accomodate the sensor wire permanently attached. Simply disconnect the bullet connector and unscrew the sensor.

A few words of advice: 1. Be very careful around a hot exhaust system; wait for the pipes to cool down a bit, 2. WEAR SAFETY GLASES; there is a lot of metal that flakes off the exhaust system every time you touch it, 3. The sensors are best reached from under the car; be sure to use jack stands to properly support the vehicle,

Answerit is located on your exaust manifold under the vehicleIt's likely there will be one for each head on six's and eight's just before were the "Y" pipe meets the exhaust manifolds, another just before the catalytic converter and yet another after the converter.This doesn't mean you 4, but it's possible. AnswerAs I understand it, Bank 2 should indicate driver side, and sensor 1 should be the sensor closest to the front of the car, upstream of the catalytic converter. The safest way to find out for sure, is to find an honest Ford service technician and ask! Good luck AnswerHere is the oxygen sensor, and their location designations explained:They are screwed into the exaust system at various points. Some people say that there are 4 oxygen sensors, but technically,that is not correct. Only the front 2 are considered oxygen sensors. They are screwed into the exaust pipe, one on each bank,after the exaust manifold, but before the catalytic converter. Sometimes they are screwed directly into the exaust manfold itself. The other 2 are actually called catalyst moniters. They are oxygen sensors, but they serve a different purpose. They moniter the activities of the catalytic converters, thus the name, catalyst moniters. They are screwed into the exaustone on each bank,after, or downstream, of the catalytic converters. On a 4 cyl engine, there are only a total of two such sensors,the one in front of the catalytic convertor is the O2 sensor, the one behind the cat is the catalyst moniter. The location names for them are as follows: On a 4 cyl, the front is called "bank 1 sensor 1" and the rear sensor is called "bank 1, sensor 2." On a V6 or V8 engine, the passenger's side bank on a forward facing engine, or the bank closest to the firewall on a transverse mounted engine, is bank number 1, so the forward sensor on that bank would be "bank 1, sensor 1." The driver's side bank(forward mount engine), or front bank(transverse engine) would be bank number 2, thus the forward sensor on that bank would be "bank 2, sensor 1," and the rearmost sensor on that bank would be "bank 2, sensor 2." AnswerThere will be either 2 or 3 oxygen sensors. One sensor is in the header and one (or two) are "Post" catalytic converter. Most of the late model Ford V6 engines contain 3 sensors. These are screwed into the header and into you exaust pipe. This is a very easy and quick project. All of the sensors should be easy to locate. They stick out of you header and exaust pipe about 1.5 - 2 inchs. Just unscrew, unsnap from the wire harness and reverse this process with the new sensors. You should unconnect the battery during this process, this will also reset you check engine light. Goodluck.