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#2139809 - 09/14/10 06:04 PM O2 sensor question
BlueFusion Offline
Over the Hill

Registered: 05/24/09
Posts: 2819
Loc: /root
I bought 2 new Motorcraft upstream HO2 sensors but did not install them yet.

I have no codes/CEL but have nearly 108k on the factory sensors. Would it actually help performance and mileage if I replace them now or would it just be a waste until a code does get set?

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#2139820 - 09/14/10 06:20 PM Re: O2 sensor question [Re: BlueFusion]
SCHALLZ Offline
Poobah

Registered: 07/02/09
Posts: 5439
Loc: La Crosse WI, USA
i have heard it does help performance

it is one of the things i will be doing this winter
_________________________
02 MGM, UD Pulleys, Hi-Tech cams, Full SW exhaust, Accufab Plenum, BBK 75mm TB, TB and Plenum Spacer, MZT Tune by APS Autoworks, J-Mod, 4.10 gears W/track-lock and cobra clutches , Typhoon Intake, Easton Drop Springs, Addco Sway bars, Axel Girdle, Heinous Control Arms


Had a Stereo but it exploded, time to make it fast then get back to being LOUD

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#2139826 - 09/14/10 06:26 PM Re: O2 sensor question [Re: SCHALLZ]
vct Offline
Member

Registered: 07/19/10
Posts: 221
Loc: Fort Wayne, IN
You already bought them, might as well throw them in before the old ones do fail.
_________________________
02 CVPI 125K
3.27 Trac-lok, Magnaflow High Flow Cats.

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#2139865 - 09/14/10 07:16 PM Re: O2 sensor question [Re: vct]
Tracy Offline
Over the Hill

Registered: 09/07/09
Posts: 3834
Loc: West Bend, WI, USA
 Originally Posted By: vct
You already bought them, might as well throw them in before the old ones do fail.


Exactly
_________________________
1999 Deep Wedgewood Blue & Rust P71, 21x,xxx miles, full cloth interior, 3L55 RAR, BH1976 Headlight Relay Harness, and a few other mods. Former Chippewa Falls, WI PD car. I'm the 3rd owner of car.
Now with Mustang Wheels, Honeycomb Grille, and Ford AM/FM CD player with RDS.



Download your Owner's Manual FREE from the Ford Owner's Site

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#2139970 - 09/14/10 09:49 PM Re: O2 sensor question [Re: Tracy]
Steve83 Offline

Poobah

Registered: 10/03/04
Posts: 7453
Loc: Memphis, TN 38060, USA, Earth,...
No, oxygen sensor aren't maintenance items. If they're bad, replace them. If they're OK, leave them alone.

Could new ones make the car perform better? Of course. So could new tires, new fuel filter, new transmission, new brakes, new wiper motor... Are you gonna replace any of them before they need it?
_________________________
Walk softly & carry a BIG SIX ! ! !

. . .

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#2140083 - 09/14/10 11:34 PM Re: O2 sensor question [Re: Steve83]
vct Offline
Member

Registered: 07/19/10
Posts: 221
Loc: Fort Wayne, IN
it's a concept called preventive maintenance.. and yes, i would replace items once they start to show signs of excessive wear before they completely fail and cause damage to other parts or in case of the breaks my and others health. O2 sensors on cars with OBD II usually have a recommended lifespan of 100,000. I recently changed mine (didn't have a CEL) and noticed an improvement.

I wouldn't go out and buy a set if there is no issues, but if you suspect that you have lost power (enough of a reason in my book to do maintenance) and you are in the maintenance window i would change them.


Edited by vct (09/14/10 11:39 PM)
_________________________
02 CVPI 125K
3.27 Trac-lok, Magnaflow High Flow Cats.

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#2140125 - 09/15/10 12:11 AM Re: O2 sensor question [Re: vct]
BlueFusion Offline
Over the Hill

Registered: 05/24/09
Posts: 2819
Loc: /root
Well like I said, I have nearly 108k on the originals. I don't know if they're affecting performance and I still get similar mileage to what I've been getting for years...maybe slightly less. I just ordered the pair with my timing tensioners and arms cause they were $37/each (vs. $70/each at the dealer/O'Reillys) and didn't cost anything extra in shipping.

I'm still debating whether I want to make the effort to install them now. If the new ones would be good for another 100k, they'd easily last the rest of the life of this car. But then again with 3 panthers in the family, if one should actually go bad, I have a replacement on hand.

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#2140129 - 09/15/10 12:14 AM Re: O2 sensor question [Re: BlueFusion]
SCHALLZ Offline
Poobah

Registered: 07/02/09
Posts: 5439
Loc: La Crosse WI, USA
install them keep the old ones as backup if u wish
_________________________
02 MGM, UD Pulleys, Hi-Tech cams, Full SW exhaust, Accufab Plenum, BBK 75mm TB, TB and Plenum Spacer, MZT Tune by APS Autoworks, J-Mod, 4.10 gears W/track-lock and cobra clutches , Typhoon Intake, Easton Drop Springs, Addco Sway bars, Axel Girdle, Heinous Control Arms


Had a Stereo but it exploded, time to make it fast then get back to being LOUD

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#2140133 - 09/15/10 12:16 AM Re: O2 sensor question [Re: SCHALLZ]
odddoylerules Offline
Member

Registered: 12/14/09
Posts: 224
Loc: WA
where were they that inexpensive? i think i need new ones
_________________________
ROAD TRIP KING 88k mile 97 LX vic TRAC-LOC 2.73 gears + B&M supercooler, 96 VPX3 ECU + tranny controller + Moates & Innovate tune, 185 t-stat 91 octane = 29.2 MPG no knock

FULLY loaded. Rural mixed/hwy Olympic Peninsula ccw lap.

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#2140212 - 09/15/10 03:23 AM Re: O2 sensor question [Re: odddoylerules]
Steve83 Offline

Poobah

Registered: 10/03/04
Posts: 7453
Loc: Memphis, TN 38060, USA, Earth,...
 Originally Posted By: vct
it's a concept called preventive maintenance.
And who literally wrote the book on it? Ford. And they didn't feel the need to include oxygen sensors on the list. Why do you think that was? Have you ever read the maintenance manual for your car?
 Originally Posted By: vct
...excessive wear before they completely fail...
What's "excessive wear" for an oxygen sensor? And no one has suggested letting anything "completely fail". When the sensor goes out-of-spec twice, the EEC will let you know. That's not "complete failure", and doesn't cause any damage to anything.
 Originally Posted By: vct
O2 sensors on cars with OBD II usually have a recommended lifespan of 100,000.
Where did you find this usual recommendation? I've been repairing cars of all makes professionally for several years, and I haven't found even one manufacturer that includes oxygen sensors on the regular maintenence schedule, at 100K or any other mileage. My Bronco's oxygen sensor has roughly 450Kmi on it, and it runs fine - just the way it did at 80K, when I pulled it out of a wreck in a junkyard. My CV also has JY oxygen sensors (no idea how many miles on them, but certainly more than 200K) and runs fine.
 Originally Posted By: vct
I recently changed mine (didn't have a CEL) and noticed an improvement.
Great. Put a new MAF in it, and I bet you'll see another improvement. Then put in a new engine. And new headlight bulbs. Not because it needs any of those things - just to have improvements. Being rich must be nice.
 Originally Posted By: vct
I wouldn't go out and buy a set if there is no issues...
Did you read the first post in this thread? He has no issues - he just bought a set.
_________________________
Walk softly & carry a BIG SIX ! ! !

. . .

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#2140214 - 09/15/10 04:15 AM Re: O2 sensor question [Re: Steve83]
vct Offline
Member

Registered: 07/19/10
Posts: 221
Loc: Fort Wayne, IN
1. yes i have read the manual.
2. It's not a ford recommendation, it comes from the manufacturers of the o2 sensors. As a mechanic I would assume that you would have noticed that engineers don't always note everything in the books. They assume that if the o2s get bad enough that it will trip to CEL, but just because it's not tripping the CEL doesn't mean it's working to full spec.
Rock auto has the recommendation right in the item description for the bosch ones:

"Part Image
$37.79 $0.00 $37.79
Add to Cart
BOSCH Part # 15717 More Info {Oxygen Sensor}
Two required; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles; OE Type - Downstream
Two required; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles; OE Type - Upstream"
from: http://www.rockauto.com/catalog/raframecatalog.php

3. Doesn't surprise me with the bronco, those things just keep going and going not matter what you do to them. Thats awesome that they are working for you that long. Do you ever test them to see how well they are actually working just out of curiosity? I'm by no means rich... I look at fixing things like O2 sensors as an investment. Sure it might cost $70 for the two upstream, but if the old ones were causing a rich condition then they are payed off over time through gas savings and other parts of the car not having to deal with it and being replaced. The more optimal the car is running the cheaper it is to run.

4. Yes i read that also, but if you have them why not use them even if they might only give you a slight improvement? I was simply saying if there isn't a noticeable condition i wouldn't go out of my way to get them. He already has them in hand.


http://www.aa1car.com/library/o2sensor.htm
http://www.autohausaz.com/html/emissions-oxygen_sensors.html
http://www.counterman.com/Article/78578/technical_forum_when_should_an_oxygen_sensor.aspx
http://www.autotap.com/techlibrary/replacing_oxygen_sensors_preventive_maintenance.asp



Edited by vct (09/15/10 04:27 AM)
_________________________
02 CVPI 125K
3.27 Trac-lok, Magnaflow High Flow Cats.

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#2140245 - 09/15/10 08:17 AM Re: O2 sensor question [Re: vct]
AACoPD05 Offline
Over the Hill

Registered: 10/02/08
Posts: 1485
Loc: Maryland
You got them, put them in, it certainly cant hurt and you should see a slight improvement. They were a pain to put in on my '92. Not sure if they are in the same place on a '00 but moving the splash guard and going in that way was the the best way I found at getting at them. Have fun!
_________________________
2004 Ford Crown Victoria LX Sport - 1 of 2656 - Midnight Gray w/Dark Charcoal
Mods: 21mm rear sway bar, Marauder head unit, Marauder sub/amp, Ford "premium" two-way door and deck speakers, Curless cure, Ford Focus fog lamps with Marauder head light switch, trunk organizer, short over head console with Homelink.

2001 F250 crew cab, 7.3L Diesel

2017 Explorer Police Interceptor

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#2140255 - 09/15/10 09:07 AM Re: O2 sensor question [Re: AACoPD05]
Xerses Offline
Climber

Registered: 04/06/10
Posts: 780
Loc: Ste-Therese, Quebec, Canada
Where exactly are the O2 sensors on a P71?
Are they difficult to change?
I looked at Rock Auto's site, but am confused as to which O2 sensor I should order. Motorcraft is my preference. Can anyone point out the model number?

I find that my gas mileage has dropped and changing them could help improve it according to a link in the last post by VCT.
_________________________
2006 P71 - SOLD!
Owner of a 2014 Subcompact, half the size & half the weight of my old P71, but 1/4th the gas! Will eventually rejoin the Crown Vic family.

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#2140332 - 09/15/10 11:49 AM Re: O2 sensor question [Re: Xerses]
SCHALLZ Offline
Poobah

Registered: 07/02/09
Posts: 5439
Loc: La Crosse WI, USA
from rock auto

MOTORCRAFT Part # DY1040 {#5C5Z9F472BA, XC2Z9F472BA}
Before 12/05/05; 5C5A-9F472-BA; Front

36.79
_________________________
02 MGM, UD Pulleys, Hi-Tech cams, Full SW exhaust, Accufab Plenum, BBK 75mm TB, TB and Plenum Spacer, MZT Tune by APS Autoworks, J-Mod, 4.10 gears W/track-lock and cobra clutches , Typhoon Intake, Easton Drop Springs, Addco Sway bars, Axel Girdle, Heinous Control Arms


Had a Stereo but it exploded, time to make it fast then get back to being LOUD

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#2140394 - 09/15/10 01:07 PM Re: O2 sensor question [Re: SCHALLZ]
Xerses Offline
Climber

Registered: 04/06/10
Posts: 780
Loc: Ste-Therese, Quebec, Canada
 Originally Posted By: SCHALLZ
from rock auto

MOTORCRAFT Part # DY1040 {#5C5Z9F472BA, XC2Z9F472BA}
Before 12/05/05; 5C5A-9F472-BA; Front

36.79

Thanks! What does Before "12/05/05" mean? I have a 2006, does that mean I need...

MOTORCRAFT Part # DY1060 {#6L7Z9F472BA}
From 12/05/05; 6L7A-9F472-BA; Front


Edited by Xerses (09/15/10 01:09 PM)
_________________________
2006 P71 - SOLD!
Owner of a 2014 Subcompact, half the size & half the weight of my old P71, but 1/4th the gas! Will eventually rejoin the Crown Vic family.

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