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Free YES FREE! Complete Factory Service Manuals
Here: https://www.nicoclub.com/archives/nissan-pathfinder-factory-service-manuals.html

Part 2 can be found here: https://youtu.be/HB4facMoqpA

My 95 Pathfinder idles fine but stumbles when the gas peddle is pressed fast, like pulling out into traffic.
I pulled the ECM Codes and it gave me two codes; 12 (MAF Senor) & 33 (Heated O2 Sensor).
You can see how to pull ECM codes on 88 to 95 Pathfinders and a list of all ECM Codes here:

The 12 code in my case was not related to the problem, it was a loose wire on the MAF sensor that I had fixed, but I hadn’t cleared the code before I pulled the codes for this particular problem.

The Heated O2 Sensor works by preheating the tip to a specific temperature and then sensing the differences.

95 Pathfinder O2 Sensor wire connections are:
1. Heater: Two wires of the same color.
2. O2 Sensor Output: Odd colored wire and the O2 case, threaded area.

You can test the O2 Sensors Heater and O2 Sensor outputs by:
- 1. Measuring the Heater Element.
- 2. Checking the voltage output of the Heated O2 element.

Here’s how to perform those checks:

- Test one: The heater element:
1. Place an ohm meter on the two wires of the same color, it should read about 6 Ohms.
2. Connect the two same colored wires to the battery, if it heats, the heater in it is good.

- Test two: The O2 Sensor Element:
1. Place a voltmeter on the case and the odd colored wire.
2. Heat the tip externally with a propane torch, and if good should show 1vdc +/- .2vdc. I also suppose you could disconnect the O2 sensor connector and place leads on it and then check the voltage with the vehicle running. I’ll investigate this later.
*** NOTE Ensure the voltmeter has VDC selected before connecting the meter leads to the element.
Do not run an ohm check on the odd colored wire and the case, as i’ve been informed that the O2 Element can be easily damaged
by voltage running through it by the ohm meter. Ohm meters work by applying a small 1vdc signal through the wires and across the
item to be tested then measuring the dropped amount of voltage and equating this to ohms.

Here’s a video, by YouTubes Jennies Garage, you can watch how to test the sensor outside of the vehicle and compare it to a new sensor. https://www.youtube.com/watch?v=QM2jO0_Cah0
Also a video by ADP Training has a good video as well here: https://www.youtube.com/watch?v=fBQ-1pqSoXM

I purchased my Delphi High Performance Oxygen Sensor O2 P/N: ES10383, at SAE Parts Co. on Ebay $29.97 at the time of this video posting.

Time permitting I’ll edit the rest of the video I shot and post it some time this week.

To remove a rusty O2 Sensor:
– 1. Put some PB Blaster or WD40 or some kind of penetrating oil on the sensor where it threads into the exhaust pipe.
– 2. Drive the car around the block to expand the exhaust pipe, it will expand more than the O2 sensor relieving some of the stress making it easier to unscrew.
– 3. Disconnect the O2 sensor plug as shown in the video and tie a 5 foot string to the connector and attach the other end to the connector tower.
– 4. Disconnect the O2 wire from the retaining clip by the Transmission Dip stick.
– 5. Put a 22mm wrench on the O2 sensor and turn it counter clockwise until it’s off. Remove the wiring harness clip by the transmission dip stick. Then pull the wire and string down to the bottom of the car. A person on top to help guide with wire and string is a great help.
– 6. Grab your new O2 sensor and put the copper anti-seize compound on the threads, try not to get any on the sensor area.
– 7. Screw in the new O2 Sensor and snug it up.
– 8. Untie the string off the old O2 sensor and tie it to the connector end on the new O2 sensor.
– 9. Go to the top of the car and grab the string tied to the connector tower and pull the new O2 sensor connector up.
– 10. Route and plug in the O2 sensor connector.
– 11. Start the car and take it on a test drive.
– 12. Erase the Check and write down any ECM codes and Erase the ECM codes to turn the Check Engine light off.
See my video on how to do this here: https://www.youtube.com/watch?v=6RK4ADgSKTA

Recheck the codes after driving it to ensure the 33 cleared and the problem is solved.

Errors in the video:
1. At 1:05 I say we’re going to show you where the O2 sensor is, I should have said O2 Sensor connector.
2. At 2:38 I say ViceGrips instead of Needle Nose Pliers.
3. At 4:51 The Drivers rear wheel is identified as the Passengers Rear Wheel.

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Thanks for watching.
Best Wishes n Blessings Keith