Here's my story...

About a week ago I left work and the check engine light came on. I went to the mechanic I use (and trust much more than a dealer) and he told me that it was the rear o2 sensor code, but he tried to diagnose the sensor and it appeared to be ok. Yes, I know I could have diagnosed it but I was short on time.

Well, today I start the car and the light is back.

question 1: can the o2 sensor be "checked" ?
question 2: how much should it cost to replace (parts and labor -- I'm really short on personal time so I figured I would have the mechanic do it)?

Thanks

 

Yes. This can be done with an automotive oscilloscope. There are also some electronic testers made for this specific purpose.

Somewhere in the $100 - $150 range. It depends on the brand of replacement part used and the labor rate of your trusted mechanic. Labor rates vary from place to place. In general, labor costs more in urban areas and less in rural areas.

A note of caution: The Check Engine Light and underlying Diagnostic Trouble Code meant the Engine Control Module (the computer) didn't like the signal it received from the Oxygen Sensor. That means something was wrong with the sensor itself, or the wiring between the sensor and the ECM. Your sensor was checked and judged to be okay. There might be a problem with the wiring. Replacing a good sensor with a different good sensor will not repair a wiring problem.

[Edited by Daniel B. Martin on 01-09-2001 at 02:12 PM]

 

There was a recall on O2 sensors for 95-96, not sure about the 97's though. I had all of mine replaced for this reason. You might wanna check with Nissan to see if there's a recall for your year, or see if anyone else here had their 97 Max's O2 sensor repaired under recall.

 

I have a terrible memory but I believe I payed $80(?) or so from courtesy Nissan for the part. It was very very simple to replace btw...

1. Remove heat shield on cat. (here kitty kitty)
2. Unbolt o2 sensor.
3. Unplug 02 Sensor.
4. Reinstall heat shield.

Wizeguy