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O2 sensor recommendation #5192219 08/20/19 04:15 PM
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Number_35 Offline OP
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Guys, looking for some advice here. I'm thinking of considering replacing the upstream O2 sensor on our '09 Mazda 5 (Duratec 2.3, 169K km [105K miles]). No codes or driveability issues, this would be to maintain present performance and economy. There was a recent thread on here, and I've read elsewhere, that O2 sensors gradually lose their efficacy, and allow the engine to run increasingly richer. 160K km/100K miles is often cited as a reasonable mileage at which to change out the O2 sensor.

I will check the dealer, but expect that the part will be quite expensive.

Does anyone know who the OEM manufacturer was?

Rock Auto lists Ultra-Power, Walker, and Bosch as "economy" options, and NTK, Denso, and AC Delco as "daily driver" options. Thoughts on the relative quality of these?

https://www.rockauto.com/en/catalog...t+&+emission,oxygen+(o2)+sensor,5132

Thanks in advance for your help!

Re: O2 sensor recommendation [Re: Number_35] #5192222 08/20/19 04:21 PM
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PandaBear Offline
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Usually it is Denso or NTK for Japanese, AC Delco rebadge others.

You can tell who manufactures what by looking at the rockauto photos and compare Denso, NTK, or Bosch (the 3 real manufacturers), and check for who made the OEM by looking for the photos online (on DIY video of the old sensor).

I've used the cheaper sensor brands that "matches" the Denso OEM with no problem, on my 97 and 95 Toyota / Honda.


"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: O2 sensor recommendation [Re: Number_35] #5192241 08/20/19 04:46 PM
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Kestas Offline
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I've saved money by buying universal O2 sensors. They come without the connector. You have to splice the old connector to the new sensor. You can save about half the money.

Re: O2 sensor recommendation [Re: Number_35] #5192252 08/20/19 04:57 PM
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Leo99 Offline
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If you have a $20 USB OBD2 reader and android device with Torq Lite, you can graph the voltage coming from the O2 sensor and see if it's getting lazy. I change them out when they throw a code.


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles (RIP)
2004 Corolla 125,000 miles
2004 Rav4 392,000 miles
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Re: O2 sensor recommendation [Re: Number_35] #5192257 08/20/19 05:00 PM
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Kira Offline
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My upstream O2 sensor went out with a CEL at 159,227 mi.
I read that the Volvo system was sensitive to bad, fake O2 sensors.
The original sensor was branded both Volvo and Denso so I bought a Denso. No probs at all.

My sensor must've just died. My mileage was solid 26-27. One week I saw the needle plummet whilst driving. Cost the cat 3 of its lives.
Detection, procurement and installation occurred within 2 weeks.
Mileage went back to 26-27.
I too have read of replacing them as a matter of maintenance.



Re: O2 sensor recommendation [Re: Number_35] #5192275 08/20/19 05:21 PM
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rekit Offline
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Interesting warning on the Denso spec page I was looking at for one for my Tacoma.

ATTENTION
Inspect contents before
opening. Once this
package has been
opened, it cannot be
returned.

Re: O2 sensor recommendation [Re: Number_35] #5192277 08/20/19 05:23 PM
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bdcardinal Offline
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LFL7-18-8G1C is the part number for the air/fuel ratio sensor, and LF5G-18-861A is the number for the cat monitor.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: O2 sensor recommendation [Re: Number_35] #5192283 08/20/19 05:45 PM
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379KITTY Offline
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I had an interesting experience. Replaced a pre-cat O2 sensor 2002 GMC Safari 4.3 due to CEL. OEM was Denso, replaced with Bosch only due to convenience. Didn't think it would matter as Bosch was listed on parts store computer as correct. After installation still had code. A little research discovered (this particular vehicle/engine) was not happy with anything other than Denso. Had something to due with the switching parameters of the sensor. Sure enough, ordered Denso, installed - been fine ever since. This may just be an oddball scenario as Bosch certainly provides many OEM's.

Re: O2 sensor recommendation [Re: Number_35] #5192285 08/20/19 05:46 PM
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Trav Offline
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Rock Auto is screwy with this economy and daily driver routine. Bosch and Walker are not economy sensors (the Bosch cost more than many in their list), Walker uses a Denso or NTK (sorry I don't remember which one I have to look it up) pill and wires it in the USA.
I have used many of them and found the connector and length to be as good or better than any on the market. Bosch is quite possibly OE on a Ford engine. The only two I would not buy from the list is Ulta Power (garbage) and the Delco which is way over priced, the rest are all good.


ASE L1, Master. Deutsch Meisterbrief.
Re: O2 sensor recommendation [Re: Number_35] #5192327 08/20/19 06:44 PM
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ejes Offline
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I think I've replaced O2 sensors in the last 4 years on a Toyota, a Dodge and a Chevy. I'm pretty sure I replaced all with Denso and they have worked well.

Last edited by ejes; 08/20/19 06:45 PM.
Re: O2 sensor recommendation [Re: 379KITTY] #5192337 08/20/19 06:51 PM
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user52165 Offline
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Originally Posted by 379KITTY
I had an interesting experience. Replaced a pre-cat O2 sensor 2002 GMC Safari 4.3 due to CEL. OEM was Denso, replaced with Bosch only due to convenience. Didn't think it would matter as Bosch was listed on parts store computer as correct. After installation still had code. A little research discovered (this particular vehicle/engine) was not happy with anything other than Denso. Had something to due with the switching parameters of the sensor. Sure enough, ordered Denso, installed - been fine ever since. This may just be an oddball scenario as Bosch certainly provides many OEM's.


Not oddball. Bosch has a poor reputation for replacement 02 sensors, especially the universal types.

Re: O2 sensor recommendation [Re: Number_35] #5192353 08/20/19 07:17 PM
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zzyzzx Offline
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I put Bosch in everything, except Toyota's, where I use Denso. Haven't had one go bad yet.

Re: O2 sensor recommendation [Re: Kestas] #5192354 08/20/19 07:18 PM
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Originally Posted by Kestas
I've saved money by buying universal O2 sensors. They come without the connector. You have to splice the old connector to the new sensor. You can save about half the money.


Not worth it these days when rock auto's aftermarket sells for only $30 or so, instead of the $50 or $60 from the past.

Last edited by PandaBear; 08/20/19 07:20 PM.

"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: O2 sensor recommendation [Re: zzyzzx] #5192409 08/20/19 08:13 PM
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clinebarger Online Content
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Originally Posted by zzyzzx
I put Bosch in everything, except Toyota's, where I use Denso. Haven't had one go bad yet.


Me neither......Though I hope this doesn't turn into a Bosch bash thread.

If this Mazda has Ford DNA.....Bosch was likely the OE manufacturer.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: O2 sensor recommendation [Re: Number_35] #5192429 08/20/19 08:27 PM
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spasm3 Online Happy
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I usually use denso, but i have used bosch in a ford escape without issue.


13 elantra 78k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 12300 miles m1 0w30
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