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Worth changing O2 Sensor without error code? #4538848
10/10/17 08:59 AM
10/10/17 08:59 AM
Joined: Mar 2008
Posts: 5,947
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 5,947
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?


2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: Worth changing O2 Sensor without error code? [Re: ZZman] #4538852
10/10/17 09:04 AM
10/10/17 09:04 AM
Joined: Jun 2003
Posts: 17,377
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,377
Deplorable in apple valley, ca
I replaced mine @110k. No codes but power and mpg both got better.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Worth changing O2 Sensor without error code? [Re: Chris142] #4538860
10/10/17 09:08 AM
10/10/17 09:08 AM
Joined: Jan 2008
Posts: 10,707
OH
SatinSilver Offline
SatinSilver  Offline
Joined: Jan 2008
Posts: 10,707
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.

Re: Worth changing O2 Sensor without error code? [Re: ZZman] #4538862
10/10/17 09:09 AM
10/10/17 09:09 AM
Joined: Sep 2016
Posts: 513
Vienna, VA
TinyVoices Offline
TinyVoices  Offline
Joined: Sep 2016
Posts: 513
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Usually not until they fail emissions if they have not been replaced by a wideband at that point.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.


1993 Toyota MR2 Hardtop N/A - 160k miles - Valvoline Max Life 5w30
2006 Toyota Matrix XR AWD (Fiancee) - 130k miles - Valvoline Max Life 5w30
Re: Worth changing O2 Sensor without error code? [Re: ZZman] #4538863
10/10/17 09:10 AM
10/10/17 09:10 AM
Joined: Mar 2013
Posts: 4,790
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 4,790
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.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Re: Worth changing O2 Sensor without error code? [Re: SatinSilver] #4538867
10/10/17 09:22 AM
10/10/17 09:22 AM
Joined: Jun 2003
Posts: 17,377
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,377
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.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Worth changing O2 Sensor without error code? [Re: ZZman] #4538871
10/10/17 09:29 AM
10/10/17 09:29 AM
Joined: Mar 2008
Posts: 5,947
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 5,947
Michigan
One of my vehicles has 96,000 miles and the other 130,000.


2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: Worth changing O2 Sensor without error code? [Re: ZZman] #4538874
10/10/17 09:30 AM
10/10/17 09:30 AM
Joined: Jun 2010
Posts: 591
Florida
Dumc87 Offline
Dumc87  Offline
Joined: Jun 2010
Posts: 591
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.


'90 Z32 - PP HM 10w30
'98 ZJ - PYB HM 10w40
'02 G20 - QS UD 5w30
'09 Matrix - QS UD 0w20
Re: Worth changing O2 Sensor without error code? [Re: ZZman] #4538878
10/10/17 09:32 AM
10/10/17 09:32 AM
Joined: Sep 2014
Posts: 1,447
Toronto Canada
WobblyElvis Online content
WobblyElvis  Online Content
Joined: Sep 2014
Posts: 1,447
Toronto Canada
I wouldn't replace one unless I suspected it had failed in some manner. It's never happened with my cars.

Re: Worth changing O2 Sensor without error code? [Re: ZZman] #4538923
10/10/17 10:12 AM
10/10/17 10:12 AM
Joined: Apr 2013
Posts: 2,334
The Northeast
mclasser Offline
mclasser  Offline
Joined: Apr 2013
Posts: 2,334
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.


2018 Hyundai Elantra VE -- 4K
2013 Honda Pilot EX-L 4WD -- 56K
2002 Honda Accord EX-L -- 211K

Re: Worth changing O2 Sensor without error code? [Re: ZZman] #4538948
10/10/17 10:37 AM
10/10/17 10:37 AM
Joined: Apr 2012
Posts: 5,168
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,168
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.

Re: Worth changing O2 Sensor without error code? [Re: ZZman] #4538965
10/10/17 10:57 AM
10/10/17 10:57 AM
Joined: Aug 2008
Posts: 3,172
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,172
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)

Re: Worth changing O2 Sensor without error code? [Re: Reddy45] #4538989
10/10/17 11:11 AM
10/10/17 11:11 AM
Joined: Apr 2012
Posts: 5,168
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,168
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....

Re: Worth changing O2 Sensor without error code? [Re: ZZman] #4539018
10/10/17 11:54 AM
10/10/17 11:54 AM
Joined: Aug 2011
Posts: 9,560
Boston, MA
HerrStig Offline
HerrStig  Offline
Joined: Aug 2011
Posts: 9,560
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.

Re: Worth changing O2 Sensor without error code? [Re: Reddy45] #4539019
10/10/17 11:56 AM
10/10/17 11:56 AM
Joined: Aug 2011
Posts: 9,560
Boston, MA
HerrStig Offline
HerrStig  Offline
Joined: Aug 2011
Posts: 9,560
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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