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.

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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)

Z_ealot

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

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

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

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2012 370z 7AT- ES2 with PSS, K&N Drop-ins, LED's all around, Berk HFC, FI CBE non-res, KW V1's
2003 A4 5MT- The Beater

Z_ealot

Cleaned those when i first got the car, inspected them just this last weekend and not very much buildup on them. Only things i can think of that might cause the hesitation are a vacuum leak, dirty fuel injectors or possibly a faulty abs sensor. I've looked for a vacuum leak before and couldnt find anything, but that doesnt mean there isn't one, im running fuel injector cleaner through the gas tank right now so i suppose we'll see if that helps and the only reason i mention anything about the abs sensors is because when i have vdc turned on i get a wheel slip light along with the slight hesitation. Car runs perfect otherwise, just going crazy trying to track down the cause of the hesitation


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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

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

What are your tyre sizes .... OEM ?

No codes to indicate wheel speed sensor issues ?

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.

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G37S Sedan 6MT, Eibach swaybars, Invidia Exhaust, Weaker Clutch Pedal Spring

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Z_ealot

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


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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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JARblue

Did you check the back side of the butterfly valve on the throttle bodies? I've cleaned mine twice in 80K miles - the first time I didn't think they were even that dirty until I actually removed them and looked at the back side

Also, VDC will brake for you when wheel slip is detected, and it will cut throttle if you continue trying to accelerate during wheel slip. Even if you turn VDC off, the ABLS system will still pulsate the rear brakes when wheel slip is detected, although you can overpower ABLS with throttle.

Lastly, I assume this hesitation is new to you? Because the throttle lag on the stock tune is horrid. A tune will fix that right up if you haven't already.

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Z_ealot

Checked the back of the butterfly valve on the throttle body, was nice and shiny, throttle lag isnt new to me, but what im feeling isnt that. Basically what happens is this: cruising along on freeway doing 60, pin the throttle to the floor, first second car starts to take off, then the next second or so it feels like the engine cuts power, followed by full power restored all the way to redline. These symptoms are made even worse when vdc is turned on as when i lose that power from the engine for that second the wheel slip light will turn on and sometimes stays on up till about 2000rpm before redline. Tires are new so i know they have plenty of grip


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