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#4652468 - 01/31/18 06:54 PM Change all oxygen sensors or not?
lawnguy Offline


Registered: 08/17/14
Posts: 326
Loc: Florida
I have a 2000 F150 4.6 V8 with 112k miles on it. Runs great to me overall.
Should I only change all 4 of my 02 oxygen sensors now,or wait until it throws up some code on my dashboard?


Edited by wwillson (01/31/18 09:04 PM)
Edit Reason: subject clarification

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#4652471 - 01/31/18 06:58 PM Re: Change all oxygen sensors or not? [Re: lawnguy]
dlundblad Online   happy


Registered: 09/30/13
Posts: 9999
Loc: Indiana
I am all for PM, but don't fix what isn't broke.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4652479 - 01/31/18 07:10 PM Re: Change all oxygen sensors or not? [Re: lawnguy]
Trav Offline


Registered: 11/20/06
Posts: 18829
Loc: MA, Mittelfranken.de
I would wait til it either throws a code or you have to replace the manifold(s) for cracks or broken studs. Don't change the rear unless they are throwing codes, a lazy but functional rear O2 is less likely to trip a P420/430 code
_________________________
ASE L1, Master. Deutsch Meisterbrief.

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#4652483 - 01/31/18 07:13 PM Re: Change all oxygen sensors or not? [Re: lawnguy]
spasm3 Offline


Registered: 05/30/10
Posts: 8641
Loc: North Carolina
How is the fuel mileage? I have never changed rear ones, i have picked up mpg with front 02 sensors on high mileage engines. If your fuel mileage had not dropped noticably, i'd let them be.
_________________________
13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4652490 - 01/31/18 07:19 PM Re: Change all oxygen sensors or not? [Re: dlundblad]
JohnnyJohnson Offline


Registered: 10/22/09
Posts: 2731
Loc: Wet side WA
Originally Posted By: dlundblad
I am all for PM, but don't fix what isn't broke.


This! thumbsup
_________________________
2004 Toyota Corolla 121525
Out: QSUD 5W-30 Purolator One 5030
In: Valvoline ML 5w-30 TG4967 117530 2-8-18
2006 Duramax 74016
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73752 4-22-18

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#4652493 - 01/31/18 07:21 PM Re: Change all oxygen sensors or not? [Re: lawnguy]
Reddy45 Offline


Registered: 08/15/08
Posts: 2959
Loc: USA
I had an 02 F150 and after I changed out all 4 sensors, the truck idled a LOT smoother.

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#4652502 - 01/31/18 07:27 PM Re: Change all oxygen sensors or not? [Re: lawnguy]
lawnguy Offline


Registered: 08/17/14
Posts: 326
Loc: Florida
If I decide to change all 4,should I stick with motorcraft or use another brand name?

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#4652510 - 01/31/18 07:33 PM Re: Change all oxygen sensors or not? [Re: Reddy45]
Kira Offline


Registered: 08/19/10
Posts: 5203
Loc: Champlain/Hudson Valley
Work was necessary on the forward end of a friend's F-150 exhaust system.
He's still reminiscing over how the immovability of the working sensors resulted in the most severe manifold+pipe repair ever done by man.
Haven't seen it myself.

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#4652548 - 01/31/18 08:13 PM Re: Change all oxygen sensors or not? [Re: lawnguy]
Dyusik Offline


Registered: 09/26/14
Posts: 1978
Loc: US-WA
I never replace working parts. I just remove and wash with a solvent anything that is exposed to build up of crud. I "inspect" my O2s once in a blue moon, just so that they don't "rust-weld" themselves. My Heep needs that kind of attention, other cars' pipes are totally rust and crud free so I leave 'em be.
_________________________
95 Cherokee 190K DELO 10W30,XG8
07 IS250 97K FB ?w??,FULL
04 YZF-R1 19K DELO 15w40,XG7317
99 HD XL1200S 18K 76 20w50,1515
14 RX450h 30k PP 0w20,NAPAG

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#4652553 - 01/31/18 08:15 PM Re: Change all oxygen sensors or not? [Re: lawnguy]
Chris142 Offline


Registered: 06/05/03
Posts: 16811
Loc: Deplorable in apple valley, ca
I replaced the uppers on my jeep @110k. Made a huge improvement in power, mpg and response. It did not throw any codes.


Edited by Chris142 (01/31/18 08:18 PM)
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
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#4652601 - 01/31/18 08:44 PM Re: Change all oxygen sensors or not? [Re: lawnguy]
Trav Offline


Registered: 11/20/06
Posts: 18829
Loc: MA, Mittelfranken.de
Front ones on these can be a real PITA depending on how stuck they are. I may be mistaken but IIRC these are the ones I had to use a 7/8 6pt wrench on and drop the pipe because I couldn't get a socket on. Check first before buying parts.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

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#4652602 - 01/31/18 08:45 PM Re: Change all oxygen sensors or not? [Re: lawnguy]
DeafBrad Offline


Registered: 05/10/16
Posts: 236
Loc: WA
There is a way to test the sensors. Me thinks if they test ok you will not see benefits to replacing them.

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#4652623 - 01/31/18 09:02 PM Re: Change all oxygen sensors or not? [Re: Chris142]
das_peikko Offline


Registered: 01/01/18
Posts: 495
Loc: San Antonio, TX
Originally Posted By: Chris142
I replaced the uppers on my jeep @110k. Made a huge improvement in power, mpg and response. It did not throw any codes.


Some engine types have just one upstream and one downstream.
I got an upstream for $25 off eBay and it was an ACDelco too.

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#4652627 - 01/31/18 09:05 PM Re: Is this stupid or smart? [Re: lawnguy]
Blkstanger Offline


Registered: 08/13/11
Posts: 1945
Loc: Lakeside, CA
I have over 180k on the ones in my Jeep. Still working fine. Average 19mpg.
_________________________
99 Jeep WJ 4.7 185,000 Maxlife 10w30, Fram Ultra.

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#4652629 - 01/31/18 09:06 PM Re: Is this stupid or smart? [Re: lawnguy]
NYEngineer Offline


Registered: 12/12/06
Posts: 1562
Loc: NY, NY
When my Suburban hit about 120,000 miles, it threw an 02 sensor code. I changed all four of them and noticed an immediate improvement in the way the truck ran, slight mileage increase and more throttle response.
Separate note, recently, I had to replace mt drive by wire throttle body because it kept putting on the CEL with a TPS code. Again, the truck runs a little nicer.
I've always wondered if sensors got lazy with age, like they're not throwing a code but they're not as sharp as when they are new. It certainly seems that way to me.

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