When to replace o2 sensors

[Z_ealot]

Just curious, but what is the consensus on when to replace o2 sensors on our cars?


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[Duc_Z09]

When they fail.

[Z_ealot]

Originally Posted by Duc_Z09

When they fail.

Just wondering as i didnt see anything in the service manual, just replaced the catalytic converters as they were clogged and am still getting a little bit of hesitation when i go wot....have seen some places that recommend replacing them at the 100,000 mile mark, but wasnt sure if nissan had a recommended replacement interval


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[Chan Chee Hoe]

If they fail,there will be a Engine Check Light....but for best performance & if you got nothing to spend,can change it every 100,000Km[62,000 Miles].

[Z_ealot]

Originally Posted by Chan Chee Hoe

If they fail,there will be a Engine Check Light....but for best performance & if you got nothing to spend,can change it every 100,000Km[62,000 Miles].

What if they're just starting to fail and have not failed completely? I've replaced the map sensor as the previous one was a nice golden brown color on the sensor circuit itself and both maf sensors are reading good air flow....both post cat o2 sensors are reading within spec from the readings im getting from them, replaced fuel pump with new as the one that was in the fuel tank had become detached from its mounting poles. Running out of ideas as to why im getting the slight hesitation when i go wot


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[Array]

Originally Posted by Z_ealot

What if they're just starting to fail and have not failed completely? I've replaced the map sensor as the previous one was a nice golden brown color on the sensor circuit itself and both maf sensors are reading good air flow....both post cat o2 sensors are reading within spec from the readings im getting from them, replaced fuel pump with new as the one that was in the fuel tank had become detached from its mounting poles. Running out of ideas as to why im getting the slight hesitation when i go wot


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Throttle Bodies? They become dirty pretty quick cleaned mine at 45k because the car would die at startup on hot days

[Spooler]

Sounds like your VDC is turning on and that is causing the issue you see. So you loose traction and traction control kicks in by what you are describing above.

[Z_ealot]

Originally Posted by Spooler

Sounds like your VDC is turning on and that is causing the issue you see. So you loose traction and traction control kicks in by what you are describing above.

Question is why it would be turning on, all 4 tires are brand new and all the wheel hubs pass the shake test


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[BGTV8]

Originally Posted by Z_ealot

Question is why it would be turning on, all 4 tires are brand new and all the wheel hubs pass the shake test


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What are your tyre sizes .... OEM ?

No codes to indicate wheel speed sensor issues ?

[Z_ealot]

Originally Posted by BGTV8

What are your tyre sizes .... OEM ?



No codes to indicate wheel speed sensor issues ?

Tire and wheel size are both oem spec and no codes being thrown for wheel speed sensors


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[Jsolo]

Failing o2 sensors may not necessarily trip a DTC. They start failing by not responding quick enough. You can only see this on a scan tool, preferably one capable of graphing the results. If o2 output looks more square wave than saw tooth, there is a problem.

[Z_ealot]

Originally Posted by Jsolo

Failing o2 sensors may not necessarily trip a DTC. They start failing by not responding quick enough. You can only see this on a scan tool, preferably one capable of graphing the results. If o2 output looks more square wave than saw tooth, there is a problem.

Would this cause a hesitation in acceleration? My scantool doesnt have the ability to pick up on the pre cat o2 sensors, but from what i can gather from the stft and ltft it seems like the sensors are functioning, like you said though they could just not be responding quick enough which is what i suspect might be happening


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[Jsolo]

Originally Posted by Z_ealot

Would this cause a hesitation in acceleration? My scantool doesnt have the ability to pick up on the pre cat o2 sensors, but from what i can gather from the stft and ltft it seems like the sensors are functioning, like you said though they could just not be responding quick enough which is what i suspect might be happening


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Sure, O2 response plays a huge role in fueling. If the o2 is lazy, throttle response will suffer. I'd start by cleaning the throttle bodies then go from there.

[Z_ealot]

Originally Posted by Jsolo

Sure, O2 response plays a huge role in fueling. If the o2 is lazy, throttle response will suffer. I'd start by cleaning the throttle bodies then go from there.

Gave the throttle bodies a thorough cleaning when i picked the car up so i guess that leaves just one thing...well technically 2 since there is one for each side lol....question though, will a lazy o2 sensor harm the new cats in any way?


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[Jsolo]

Originally Posted by Z_ealot

Gave the throttle bodies a thorough cleaning when i picked the car up so i guess that leaves just one thing...well technically 2 since there is one for each side lol....question though, will a lazy o2 sensor harm the new cats in any way?

I'd probably get it taken care of sooner than later. Your mileage should improve too.