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#4602685 - 12/13/17 03:25 PM Toying with the idea of Replacing Oxygen Sensor
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Quote:
What are the symptoms of a bad oxygen sensor?
Symptoms of a Bad Oxygen Sensor:
When you have a bad oxygen sensor, your vehicle will run less efficiently, it can sometimes have a poor idle, erratic jerking at steady throttle, hard starting problems, cause the check engine light to come on, and will cause high fuel consumption.


Quote:
How do you know if your oxygen sensor is bad?
Check this list to see if it's time to replace YOUR vehicle's oxygen sensors:
Sudden decrease in fuel mileage....
Flashing check engine light or malfunction indicator lamp in the vehicle?s dash board....
Failure to pass smog....
Overall poor vehicle performance; rough idling, stalling, hesitation on acceleration, etc.


2000 Buick LeSabre
My fuel mileage has been pegged at 17.1 mpg for several months now. When I first bought the car when it was only 5 years old, fuel mileage was pegged at 19.6 mpg. Some websites recommend changing the oxygen sensor every 100k. The car now has over 131k and is still on the original upstream and downstream oxygen sensors. Idle quality is not super smooth and fuel mileage is down. No scanner to check fuel trims, so if I replaced the upstream oxygen sensor, it would be based on a hunch and the above info.

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#4602692 - 12/13/17 03:28 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
spasm3 Offline


Registered: 05/30/10
Posts: 8662
Loc: North Carolina
I have picked up mileage on cars past 100k by changing the upstream sensors. Not a huge change but say 1.5-2mpg.
_________________________
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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#4602693 - 12/13/17 03:29 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: spasm3]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
spasm3 - Did your engine's idle quality smooth out too ?

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#4602697 - 12/13/17 03:36 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
SatinSilver Offline


Registered: 01/24/08
Posts: 10172
Loc: OH
Could just be the winter fuel blend decrease in mpg you're noticing. See if the car still has the same mileage next June.

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#4602698 - 12/13/17 03:38 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
Kira Offline


Registered: 08/19/10
Posts: 5250
Loc: Champlain/Hudson Valley
1) "It's always the front one" uncredited quote

2) A neighbor with a V-6 @ 135mpg had all replaced when one threw a code.
She thought her garage an honest one.

3) My front O2 sensor went out and saw a measured 20% drop in mileage.
Your's fell 13%.

CONCLUSION: I don't know.

edit: spasm, 1.5 - 2 mpg AIN'T SMALL.

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#4602704 - 12/13/17 03:43 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
skyactiv Offline


Registered: 03/02/13
Posts: 4399
Loc: The Midwest
If there is an NTK sensor for it cheap, buy that. The spark plug company NGK make them.
You can test them with an oscilloscope.
http://www.sixityauto.com/ngk-ntk-oxygen...AiABEgJxi_D_BwE
_________________________
Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

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#4602705 - 12/13/17 03:43 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: SatinSilver]
Mr Nice Offline


Registered: 09/12/04
Posts: 21198
Loc: Orlando, FL
Originally Posted By: SatinSilver
Could just be the winter fuel blend decrease in mpg you're noticing. See if the car still has the same mileage next June.


True.

Or it could be a lazy O2 sensor needing replacement.

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#4602718 - 12/13/17 04:01 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Mr Nice]
SatinSilver Offline


Registered: 01/24/08
Posts: 10172
Loc: OH
Originally Posted By: Mr Nice
Originally Posted By: SatinSilver
Could just be the winter fuel blend decrease in mpg you're noticing. See if the car still has the same mileage next June.


True.

Or it could be a lazy O2 sensor needing replacement.


Or it could be dragging brakes, low tire pressure, the OP gaining weight with the holidays approaching. All sorts of things to ponder. But for $40 not a bad price for a quality part. The same NTK front 02 sensor on the Matrix runs $280. But if it was AWD the price would be around $80. crazy


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#4602736 - 12/13/17 04:32 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
PandaBear Offline


Registered: 08/05/02
Posts: 14220
Loc: Silicon Valley
You're from California. The best way to see if your O2 is working is to look at your SMOG test result. High CO, HC, NoX and you should just try a new O2. I think most cars are $20-30 from Rockauto these days. It is worth replacing as a preventive maintenance once in a while (i.e. every 100k or so).
_________________________
"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah

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#4602744 - 12/13/17 04:47 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
andyd Offline


Registered: 09/25/04
Posts: 7156
Loc: Marshfield , MA
you can test an O2 sensor with a voltmeter. A good one will dither between .2 and .9 rapidly. If it is slow to change or doesn't change , it is NG.
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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#4602757 - 12/13/17 05:02 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
simple_gifts Offline


Registered: 07/26/04
Posts: 11945
Loc: Middlesex County CT
Based on some of your posts, you should invest in an oxygen sensor in the cabin of the vehicle

j/k.
_________________________
2004 Prius; 92K ML Syn 5W-30
2007 Yaris 68K 0w-40 Castrol
2006 B2300;130K;ALM


Was driving an ox cart; Now on the USS Enterprise

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#4602772 - 12/13/17 05:17 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Any codes? I wait to replace till I get a code.
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

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#4602781 - 12/13/17 05:37 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
spasm3 Offline


Registered: 05/30/10
Posts: 8662
Loc: North Carolina
Originally Posted By: Merkava_4
spasm3 - Did your engine's idle quality smooth out too ?


No, no change, there was no idle issue for me. I just replaced them due to mileage. It was an 03 ford escape v-6 with 130k at the time.
_________________________
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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#4602792 - 12/13/17 05:50 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
NibbanaBanana Offline


Registered: 05/23/16
Posts: 292
Loc: New England
I replaced 3 out of 4 in the first six months of owning my E150. At AZ's recommendation after they scanned it for me. Every couple months I'd get a CEL. They'd scan it and recommend an O2 sensor. Did some more research after the CEL came on again. Changed the isolator bolts. It's been working for a few years now. Have a feeling I didn't need to change those O2 sensors.

Replaced the downstream in the Aveo after the scan read low voltage. After that failed to fix it I found a very small crack in the exhaust right below the sensor. Replaced the exhaust pipe and everything was fine.

Replaced one in a 1990 Dodge B250 that was bad.

Ran 185K and 186K miles on two Geo metros and never a problem with the O2 sensors.

That's my experience with O2 sensors.
_________________________
1993 Ford E350 5.8L, 68K
2002 Ford E150 4.2L, 85K
2006 Chevy Aveo 1.6L 215K
2013 Kia Reo 1.4L, 101K
7500 OCI, M1 5-30 winter, M1 10-30 summer

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#4602823 - 12/13/17 06:28 PM Re: Toying with the idea of Replacing Oxygen Sensor [Re: Merkava_4]
dishdude Online   content


Registered: 11/14/08
Posts: 8754
Loc: Phoenix
Merk, if you have money you want to throw away I'll PM you my address.
_________________________
2018 Challenger SRT

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