Oxygen sensor replacement

Hi,

The oxygen sensor is mounted on the exhaust system and on the exterior of the vehicle. It is located after the catalytic converter and before the resonator. See pic 1 for location.

Now, because there is a wire attached to it, you can't use a standard socket for removal. You have two choices. First, try to remove it with an open-end wrench. In all honesty, they are usually rusted in place and that type of a wrench usually will round off the hex, so don't allow that to happen if it seems too tight.

Second, you need to get a socket designed for the removal and install of an O2 sensor. It will be open on the side allowing the wire to be routed out of the socket. That is the best choice of tools.

You don't need to remove the seat. Also, when looking at the attached pic, make sure to read the text in the box.

Also, here is a link that explains in general how an O2 sensor is replaced. I thought it may be helpful for you.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Let me know if this helps or if you have other questions.

Take care,
Joe

After hours of searching for an answer to your question, the best I could come up with is for a 1997. Honestly, I don't know if the 1995 is the same.

https://www.youtube.com/watch?v=-ivgya9rOLo

Hope this helps... Glenn

Hi,

Now that I watched the video, I do remember the wiring going under the seat. The best way to determine if your model year is the same is by checking if the wiring goes up into the floor of the vehicle. Have you checked that yet? If it does, then the seat and carpet will need to be moved.

Joe

Hi,

Chances are, if the sensor is connected and the connection isn't damaged or corroded, the sensor is bad. You can check the resistance of the sensor itself.

If you check resistance, you should have between 11 - 16 ohms at 20°C.

Can you tell me what the code is you are getting?

Joe

Hi,

I did see it. The only thing you can do is visually inspect the wiring and connector. If that all appears good, check the resistance in the sensor. If the resistance is within spec, then we will have to start checking wiring and connections up from the sensor.

Joe

Sounds like a plan. Let me know what you find.

Joe

Hi,

When I trace wires, I have to follow a wiring schematic. They don't specifically tell you where the wire runs through the vehicle. However, it shows where the wires go to.

I attached several pics below. I started at the O2 sensor in question. I highlighted the wires from the sensor and traced them throughout the schematics so you can see where each wire goes. I don't know if it helps, but take a look through it and see if it helps you find the locations where the wiring goes. The pics are in order. If you could picture them laid out, one on top of the other, that is what I had.

I hope it helps.

Let me know.

Joe

The brown wire is connected to those things under the instrument panel (see pics). The black/orange does jump. It branches from the circuit relay.

My manual doesn't show exact locations. Just general ones.

I hope you understand. As far as driving without that sensor, the car will run fine, but you may notice a decrease in fuel mileage. That is how the computer determines the air-fuel ratio that is needed.

Since you are getting nothing when testing at the sensor and the sensor is good, I suspect the wire is damaged at some point or at the PCM. As far as the light not turning on, there could be an issue with the PCM. We will need to work back to it and if there is still nothing found with the wiring, then we will need to check at the PCM itself.

Joe

Hi,

There should be a 5 volt reference to the sensor. The ohms should be between 11 and 16 ohms.

Joe