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#4538848 - 10/10/17 08:59 AM Worth changing O2 Sensor without error code?
ZZman Offline


Registered: 03/17/08
Posts: 5786
Loc: Michigan
Cars have 2-4 sensors. Should a person wait until they actually fail and gives a code or is it really worth it or necessary to replace them as a maintenance item?
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#4538852 - 10/10/17 09:04 AM Re: Worth changing O2 Sensor without error code? [Re: ZZman]
Chris142 Offline


Registered: 06/05/03
Posts: 16820
Loc: Deplorable in apple valley, ca
I replaced mine @110k. No codes but power and mpg both got better.
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#4538860 - 10/10/17 09:08 AM Re: Worth changing O2 Sensor without error code? [Re: Chris142]
SatinSilver Offline


Registered: 01/24/08
Posts: 10165
Loc: OH
Originally Posted By: Chris142
I replaced mine @110k. No codes but power and mpg both got better.


Just the upstream one or both, or more? Which brand? Thank you.

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#4538862 - 10/10/17 09:09 AM Re: Worth changing O2 Sensor without error code? [Re: ZZman]
TinyVoices Offline


Registered: 09/12/16
Posts: 481
Loc: Vienna, VA
Usually not until they fail emissions if they have not been replaced by a wideband at that point. I have run wideband sensors and gauges in most of my previous cars as they have been modified forced induction setups.
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#4538863 - 10/10/17 09:10 AM Re: Worth changing O2 Sensor without error code? [Re: ZZman]
skyactiv Offline


Registered: 03/02/13
Posts: 4397
Loc: The Midwest
I'd wait. They tend to last longer due to todays cleaner running engines, gas with lower sulfur, lack of MMT and lower ZDDP engine oils. If you happened to have a oscilloscope you could check the condition of the sensors
and truly know the condition.
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#4538867 - 10/10/17 09:22 AM Re: Worth changing O2 Sensor without error code? [Re: SatinSilver]
Chris142 Offline


Registered: 06/05/03
Posts: 16820
Loc: Deplorable in apple valley, ca
Originally Posted By: SatinSilver
Originally Posted By: Chris142
I replaced mine @110k. No codes but power and mpg both got better.


Just the upstream one or both, or more? Which brand? Thank you.
Just the up stream ones. The others dont have anything to do with fuel mixture. I tried Bosch but they threw codes. NTK was OE in my Jeep so I bought those on rock auto. now has 50k on them.
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#4538871 - 10/10/17 09:29 AM Re: Worth changing O2 Sensor without error code? [Re: ZZman]
ZZman Offline


Registered: 03/17/08
Posts: 5786
Loc: Michigan
One of my vehicles has 96,000 miles and the other 130,000.
_________________________
2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
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2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40

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#4538874 - 10/10/17 09:30 AM Re: Worth changing O2 Sensor without error code? [Re: ZZman]
Dumc87 Offline


Registered: 06/05/10
Posts: 591
Loc: Florida
If power and MPG seem significantly weaker, you have no CEL, you've got good spark plugs and wires (if applicable) and a clean air filter, cleaning or replacing your upstream sensor may be a good move.

My dad had a '98 Dakota that ran but ran inconsistently; sometimes would just shut off at a red light. Long story short, I found one of the o2 sensors' connecting harness had melted against a portion of the exhaust pipe. No CEL though. Odd! New sensor and connector, truck ran like a champ. Major MPG improvement as well.
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#4538878 - 10/10/17 09:32 AM Re: Worth changing O2 Sensor without error code? [Re: ZZman]
WobblyElvis Online   content


Registered: 09/23/14
Posts: 1345
Loc: Toronto Canada
I wouldn't replace one unless I suspected it had failed in some manner. It's never happened with my cars.

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#4538923 - 10/10/17 10:12 AM Re: Worth changing O2 Sensor without error code? [Re: ZZman]
mclasser Offline


Registered: 04/13/13
Posts: 2229
Loc: The Northeast
You can check for lazy O2 sensors with a scan tool. Barring poisoning from oil/coolant, they should last a good while. If you need to replace, use the OEM brand. You don't have to go to the dealer but at least use a direct fit sensor of the same brand.
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#4538948 - 10/10/17 10:37 AM Re: Worth changing O2 Sensor without error code? [Re: ZZman]
Wolf359 Offline


Registered: 04/27/12
Posts: 4753
Loc: MA
I think the recommended change interval is in the 60-80k. Even if they're not bad, if you change them, gas mileage should improve slightly. Depending on the car, they can be pretty cheap. I think I got mine for around $25 from rockauto. The car had over 120k on the originals so they were overdue and I did see an improvement in gas mileage afterwards.

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#4538965 - 10/10/17 10:57 AM Re: Worth changing O2 Sensor without error code? [Re: ZZman]
Reddy45 Offline


Registered: 08/15/08
Posts: 2968
Loc: USA
I've changed them at 100k and the improvement was smoother idle. For some reason they were fairly cheap to replace on that old Ford..but it seems like o2 sensors for Toyotas are crazy expensive in comparison. ($200 vs $50)

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#4538989 - 10/10/17 11:11 AM Re: Worth changing O2 Sensor without error code? [Re: Reddy45]
Wolf359 Offline


Registered: 04/27/12
Posts: 4753
Loc: MA
Originally Posted By: Reddy45
I've changed them at 100k and the improvement was smoother idle. For some reason they were fairly cheap to replace on that old Ford..but it seems like o2 sensors for Toyotas are crazy expensive in comparison. ($200 vs $50)


Yeah, that $25 was for a Ford. My Mercedes ones are only about $100 for Bosch. Time to switch to Mercedes for cheaper parts....

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#4539018 - 10/10/17 11:54 AM Re: Worth changing O2 Sensor without error code? [Re: ZZman]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: Boston, MA
Rear sensors last a long time if the converter is in good shape. As others have said, the front (s) become slow to respond to O2 changes in the exhaust and cause strange symptoms which don't directly set codes. Happens most often after the engine has warmed up and then is allowed to cool for a short period.

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#4539019 - 10/10/17 11:56 AM Re: Worth changing O2 Sensor without error code? [Re: Reddy45]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: Boston, MA
Originally Posted By: Reddy45
I've changed them at 100k and the improvement was smoother idle. For some reason they were fairly cheap to replace on that old Ford..but it seems like o2 sensors for Toyotas are crazy expensive in comparison. ($200 vs $50)
A look at Rock Auto shows Denso sensors for many Toyotas in the 100 dollar or less range.

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