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Re: O2 sensor recommendation [Re: Number_35] #5192468 08/20/19 09:03 PM
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Skippy722 Offline
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I’m partial to NTK.


2016 Chrysler 300S v6
2018 Dodge Grand Caravan GT

Slight Mopar obsession
Re: O2 sensor recommendation [Re: clinebarger] #5192564 08/20/19 11:10 PM
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Trav Offline
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Originally Posted by clinebarger
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.


Me neither, never a problem with a Bosch 02. The reason a lot of people complain about the universals is they solder the wires effectively cutting off the sensors access to a reference air supply.


ASE L1, Master. Deutsch Meisterbrief.
Re: O2 sensor recommendation [Re: Number_35] #5192581 08/20/19 11:54 PM
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AC1DD Offline
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Bosch O2 sensors are very high quality and have good quality control.

There are FAKES that do surface more than you'd think, that might be the reason for problems. There are LOTS of fake electrical parts in the market today, and they do a pretty good job of looking like the real thing even if the quality and performance is carp.

Re: O2 sensor recommendation [Re: AC1DD] #5192646 08/21/19 06:20 AM
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That is a great point! Walbro fuel pumps has had a lot of problems with fakes that are so good they even got the installation parts content colors and hologram correct but the quality isn't there and they either fail early or don't put out the rated GPH.


ASE L1, Master. Deutsch Meisterbrief.
Re: O2 sensor recommendation [Re: Number_35] #5193170 08/21/19 05:44 PM
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DGXR Offline
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With O2 sensors, MAF sensors and other finely calibrated emissions equipment, I always try to get OEM replacement parts. Have personally seen (and heard of) way too many issues from cheap aftermarket brands. In all fairness these brands may be quality parts but still they are not quite OEM. Also remember that some makes and models are more sensitive to different brands of electronics, others are more tolerant. Your mileage may vary. I still suggest spending extra on the OEM stuff, then you're practically guaranteed to do this replacement only once laugh


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Re: O2 sensor recommendation [Re: Number_35] #5195621 08/24/19 05:30 PM
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Number_35 Offline OP
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Guys, thanks all for some great feedback.

Kestas, I did install a Bosch universal O2 sensor on our old Mazda back in 2011. Installation went fine, and the sensor seemed to work well. No codes, and no decrease in performance or gas mileage. The van went to the boneyard 8-1/2 years later with the Bosch universal. However, I later replaced an O2 sensor on our old Protege, and was able to get a model-specific one for about the same price or slightly cheaper. (Can't remember the brand, but it too worked well for the remaining life of the car.)

Leo99, I don't have a Smartphone or any of the associated auto software. This is something I'll have to look at in the future. It would be really good to be able to determine whether or not the factory sensor is becoming lazy yet.

BDC, thanks for the factory part number. I provided same to the dealer and received a quotation of C$231 - ouch!

Trav, good point that although one usually associates Japanese brands with Denso and NTK, the Duratec is a Ford-built engine which may have come with a Bosch sensor.

A couple of interesting things from the Rock Auto info buttons - NTK and Denso use the same "find your O2 sensor" graphics and mileage table for sensor replacement. They must have some sort of alliance. And Bosch claims superior O2 sensor performance - rather than cycling between low and high O2-detected thresholds, they claim that their sensors are more analogue in nature, actually switching on a continuum depending on how much O2 they sense in the exhaust.



To be continued ...

DENSO.jpgBOSCH.jpgNTK.jpg
Re: O2 sensor recommendation [Re: Number_35] #5195756 08/24/19 09:07 PM
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Your front O2 sensor is a "Wideband, Lambda, AFR" type. It doesn't switch like Narrowband O2 sensors.

Bosch is the gold standard when it comes to Lambda sensors!


2001 Chevy Camaro L92/4L80E
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Re: O2 sensor recommendation [Re: clinebarger] #5195992 08/25/19 07:53 AM
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Originally Posted by clinebarger
Your front O2 sensor is a "Wideband, Lambda, AFR" type. It doesn't switch like Narrowband O2 sensors.

Bosch is the gold standard when it comes to Lambda sensors!
Thanks ClineBarger, good information! So would I be better off going with a Bosch (or genuine Mazda part, which is quite possibly a Bosch) than a Denso or NTK? It sounds like the Denso and NTK are narrowband, correct?

Re: O2 sensor recommendation [Re: Number_35] #5209399 09/10/19 04:34 PM
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I went with an NTK. It is a wideband unit. Removal was easy (with a 22 mm crowfoot O2 sensor socket) as was installation. It may be placebo effect, but I think that the minor surging under low-RPM cruise has disappeared. The idle sounds quieter too.

Re: O2 sensor recommendation [Re: Number_35] #5209531 09/10/19 07:31 PM
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Got a Walker from RA on B1 right now.. about 20k miles on it with no issues. Threads, lead length and connector (mine came with the connector so that was a plus) was an exact fit. I cleaned up the old OE and bench tested it, still good so I kept it. It had just gotten too dirty so it was "lazy".. the preheat circuit was just fine.

Last edited by Mad_Hatter; 09/10/19 07:32 PM.
Re: O2 sensor recommendation [Re: Number_35] #5209942 09/11/19 09:06 AM
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How about instead of replacing it, just stock the o2 sensor in the house. Replace it when it died.


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Re: O2 sensor recommendation [Re: Tundragod] #5210067 09/11/19 11:58 AM
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Originally Posted by Tundragod
How about instead of replacing it, just stock the o2 sensor in the house. Replace it when it died.
There are a couple of schools of thought on maintenance - breakdown ("If it ain't broke don't fix it") and preventative ("Do it now to keep it running well"). Prevailing wisdom seems to be that O2 sensors get lazy long before they "break" (that is, trigger a code). O2 sensor deterioration is on a continuum, so when is the right time? For me, it was time to think about replacement once the manufacturer's mileage (160K km) was exceeded. Given the improvement in driveability, and the anticipated fuel savings and resultant longer cat life, it was not a hard decision. Payback, based on 5% fuel savings, will be < 2 years.

For what it's worth, our old '90 MPV (RIP) triggered a "replace O2 sensor" off the odometer every 130K km. I think the US models were set for 80K miles.

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