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Change all oxygen sensors or not? #4652468
01/31/18 07:54 PM
01/31/18 07:54 PM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
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?

Last edited by wwillson; 01/31/18 10:04 PM. Reason: subject clarification
Re: Change all oxygen sensors or not? [Re: lawnguy] #4652471
01/31/18 07:58 PM
01/31/18 07:58 PM
Joined: Sep 2013
Posts: 10,447
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,447
Indiana
I am all for PM, but don't fix what isn't broke.


03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

Re: Change all oxygen sensors or not? [Re: lawnguy] #4652479
01/31/18 08:10 PM
01/31/18 08:10 PM
Joined: Nov 2006
Posts: 19,910
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,910
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.
Re: Change all oxygen sensors or not? [Re: lawnguy] #4652483
01/31/18 08:13 PM
01/31/18 08:13 PM
Joined: May 2010
Posts: 9,047
North Carolina
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,047
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 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: Change all oxygen sensors or not? [Re: dlundblad] #4652490
01/31/18 08:19 PM
01/31/18 08:19 PM
Joined: Oct 2009
Posts: 3,214
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline
Joined: Oct 2009
Posts: 3,214
Wet side WA
Originally Posted By: dlundblad
I am all for PM, but don't fix what isn't broke.


This! thumbsup


2004 Corolla 124770
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74277
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 74705 4-22-18
Re: Change all oxygen sensors or not? [Re: lawnguy] #4652493
01/31/18 08:21 PM
01/31/18 08:21 PM
Joined: Aug 2008
Posts: 3,156
USA
Reddy45 Online shocked
Reddy45  Online Shocked
Joined: Aug 2008
Posts: 3,156
USA
I had an 02 F150 and after I changed out all 4 sensors, the truck idled a LOT smoother.

Re: Change all oxygen sensors or not? [Re: lawnguy] #4652502
01/31/18 08:27 PM
01/31/18 08:27 PM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
Florida
If I decide to change all 4,should I stick with motorcraft or use another brand name?

Re: Change all oxygen sensors or not? [Re: Reddy45] #4652510
01/31/18 08:33 PM
01/31/18 08:33 PM
Joined: Aug 2010
Posts: 5,652
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,652
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.

Re: Change all oxygen sensors or not? [Re: lawnguy] #4652548
01/31/18 09:13 PM
01/31/18 09:13 PM
Joined: Sep 2014
Posts: 2,093
US-WA
Dyusik Offline
Dyusik  Offline
Joined: Sep 2014
Posts: 2,093
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 100K Napa 10w30,FULL
04 YZF-R1 19K DELO 15w40,XG7317
99 HD XL1200S 20K VR1 20w50,1515
14 RX450h 32k PP MIX,NAPAG
Re: Change all oxygen sensors or not? [Re: lawnguy] #4652553
01/31/18 09:15 PM
01/31/18 09:15 PM
Joined: Jun 2003
Posts: 17,348
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,348
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.

Last edited by Chris142; 01/31/18 09:18 PM.

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: Change all oxygen sensors or not? [Re: lawnguy] #4652601
01/31/18 09:44 PM
01/31/18 09:44 PM
Joined: Nov 2006
Posts: 19,910
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,910
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.
Re: Change all oxygen sensors or not? [Re: lawnguy] #4652602
01/31/18 09:45 PM
01/31/18 09:45 PM
Joined: May 2016
Posts: 242
WA
DeafBrad Offline
DeafBrad  Offline
Joined: May 2016
Posts: 242
WA
There is a way to test the sensors. Me thinks if they test ok you will not see benefits to replacing them.

Re: Change all oxygen sensors or not? [Re: Chris142] #4652623
01/31/18 10:02 PM
01/31/18 10:02 PM
Joined: Jan 2018
Posts: 534
San Antonio, TX
das_peikko Offline
das_peikko  Offline
Joined: Jan 2018
Posts: 534
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.

Re: Is this stupid or smart? [Re: lawnguy] #4652627
01/31/18 10:05 PM
01/31/18 10:05 PM
Joined: Aug 2011
Posts: 2,022
Lakeside, CA
Blkstanger Offline
Blkstanger  Offline
Joined: Aug 2011
Posts: 2,022
Lakeside, CA
I have over 180k on the ones in my Jeep. Still working fine. Average 19mpg.


99 Jeep WJ 4.7 190,000 Maxlife 10w30, Fram Ultra.
Re: Is this stupid or smart? [Re: lawnguy] #4652629
01/31/18 10:06 PM
01/31/18 10:06 PM
Joined: Dec 2006
Posts: 1,696
NY, NY
NYEngineer Offline
NYEngineer  Offline
Joined: Dec 2006
Posts: 1,696
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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