Denso o2 Sensor

C

centxrunner

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I have a 99 2wd auto non-cali in need of new o2 sensors. Would the correct part I am looking for be Denso 234-4162 for both the in-front of cat sensor and the behind cat sensor? I've seen them on Amazon for $65 bucks but it says it is the wrong sensor for my vehicle.
 
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From URD:

1999 & 2000 49 State 2WD & 4WD auto V6; Front = 234-4162 1999 & 2000 49 State 2WD & 4WD auto V6; Rear = 234-4162
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I have always found URD application data to be complete and reliable. Amazon, not so much.

(Note: the other engines also show 234-4162.)
 
Yup. That's the one you need (Denso 234-4162 Oxygen Sensor Air and Fuel Ratio Sensor). I bought the same one for my 98. Paid $61.57 for it with free shipping.
 
find the part go to advance autozone. then use a coupon code ..i think DEALIO. it will give u 40% off...i just did this with my o2 sensor and got it for around 80$. denso
 
Just for sh!tz and giggles I checked the number for the air fuel ratio sensor (upstream O2 sensor) and it is indeed 234-4162. Googled it and called Autozone.
 
ShannanC said:
Just for sh!tz and giggles I checked the number for the air fuel ratio sensor (upstream O2 sensor) and it is indeed 234-4162. Googled it and called Autozone.
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Just for your info, that's an O2 sensor both before and after on the 49-state. (Otherwise, it wouldn't be the same number.) A/F's were only used on Cali. '99-'00 and 50-state 2001+ and only before the cats. A/F's were only used on two-cat systems.

P.S. No biggie but you posted the same link and same quote I did in post #2.
 
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So I received my Denso sensors and got the in front of Cat sensor replaced but when I went to remove the rear sensor I noticed the sensor wire was longer then the sensor wire on the replacement sensor. I guess I need the sensor made for the after cat with a longer wire. Would anyone know what that part number would be?
 
centxrunner said:
So I received my Denso sensors and got the in front of Cat sensor replaced but when I went to remove the rear sensor I noticed the sensor wire was longer then the sensor wire on the replacement sensor. I guess I need the sensor made for the after cat with a longer wire. Would anyone know what that part number would be?
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Hmmm, that's interesting. I mistakenly ordered the 4154 (rear for manual transmission) and I had the exact same problem. I cut off the tail from the old sensor and soldered it onto the new one to make an extension and it seems to work, though I still have a p0420, but I don't have an O2 code (171 I think?).

If you cut off the tail, I think you just match colors, and both blacks are ground, but you might also be able to match them by the order they come out of the sensor body.

Who has replaced this dumb sensor and not had this tail length issue? What PN did you order?
 
centxrunner said:
So I received my Denso sensors and got the in front of Cat sensor replaced but when I went to remove the rear sensor I noticed the sensor wire was longer then the sensor wire on the replacement sensor. I guess I need the sensor made for the after cat with a longer wire. Would anyone know what that part number would be?
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The Denso website confirms 234-4162.

Denso

Any chance the one in there was too long and the one you have is the right one? Or that you did not receive a 234-4162? Finally, are you sure you are 49-state? Lots of Cali. trucks were sold outside Cali. in '99, including mine.
 
Yes, both sensors had the same length pig tail wire. I don't think I have a Cali truck, I only have one Cat and my truck came from Gulf States Toyota distributor, which I think means it came from Japan to Houston.
 
centxrunner said:
Yes, both sensors had the same length pig tail wire. I don't think I have a Cali truck, I only have one Cat and my truck came from Gulf States Toyota distributor, which I think means it came from Japan to Houston.
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One cat definitely means 49-state. The Japan-Houston thing means nothing by itself--they were shipping Cali. cars everywhere; they didn't all go to California first.

I think I wasn't clear. Are you sure it doesn't fit? I was thinking that the existing rear sensor may be a replacement that was not the exact correct part but they used it because it worked. So maybe the one in there is longer than it needs to be.
 
Both replacement sensors have the same length pig tail wires. The original front sensor had the same length pig tail as both of the new replacement denso sensors. But that dang rear sensor has a pig tail almost twice the length as the original front and the two new sensors.
 
But will the new sensor fit, or does it HAVE to be twice as long?

If it does need to be longer, I have no idea why that is the case. I would go ahead and splice as suggested above.
 
TheDurk said:
But will the new sensor fit, or does it HAVE to be twice as long?

If it does need to be longer, I have no idea why that is the case. I would go ahead and splice as suggested above.
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Oh, it NEEDS to be longer. The harness is taut. I tried to make it fit as is, and I couldn't.

EDIT: I just e-mail Denso about this cause it is stupid that this keeps coming up.

I design automotive sensors (not O2 sensors), and dang it, they should get their crap right. I would be pretty annoyed if the end customer was cutting and splicing my designs. I also wouldn't give them a warranty if they cut and spliced, so let's see what Denso says about it.
 
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Matt(Nelsonmd)/Centx:

You guys are absolutely right. The Denso Application list is effed up.

When I run a 1999 Non-Cali auto V6 through Toyodiy, I get Toyota numbers:

Front 8946-539835 Rear 8946-539825.....two different numbers. Then, when I use the part number interchange option on the same Denso website that gave us 234-4162 for both when I fed them the application, the front interchanges to 234-4162 and the rear interchanges to 234-4153. So Denso's application data is effed up and URD clearly follows theirs. This is the first I have heard of this and I've been reading 4Runner boards for quite a few years now.

It's the same for both 2WD and 4WD Non-Cali. Auto V6's. So if you want it right, I guess 234-4153 is the way to go for the rear sensor. I can't guarantee it, but it looks like a good bet. To be more certain, you could run your VIN through a Toyota dealer (on-line like toyotapartsales.com or B&M) and see if you get the same 8946-539825. I apologize for any skepticism I projected, but I wanted to be sure we had the problem well understood.

Matt, please post up any reply from Denso. They should fix this. So should Gadget.
 
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Thanks guys!, I am having a host of other issues I assume resulting from not getting these sensors changed in a timely manner. Besides the check engine light, now the motor is missing, vibrating, backfiring at low rpm and backfiring at high rpm. I wonder if the o2 sensors going bad over time has fouled out the spark plugs or even worse ruined the engine management system.
 
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