Has anyone used DENSO O2 sensors?
 

I have a code for downtstream, and thinking about buying those two for now. Denso makes our a/c compressors, so it's probably safe.

The materials used appear better than most; stainless steel. $64 at Rock Auto.

DENSO-
Porous PTFE Filter - Allows atmospheric oxygen to enter the sensor without permitting water or engine contaminants to seep into the casing.
Robotic Laser Weld
Aluminum-Oxide Trap Layer - Keeps silicone and lead outside the ceramic elient through DENSO's exclusive design, preventing damage to the platinum electrode.
Stainless Steel Housing - Resists corrosion and contamination with a rugged, watertight body.
Double Protection Cover - Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning.
Features
Corrosion-resistant stainless steel construction
PTFE filter blocks efficiency-robbing contaminants
Refined zirconia element improves sensor response
Benefits
Superior design maximizes engine performance and fuel efficiency while reducing fuel consumption and harmful emissions
First Time Fit® delivers the right part the first time
Ensures smog test compliance

My thought is I'm ok with non Bosch for downstream but I'm going to replace some non Bosch with OE Bosch for my pre cat sensors because I'm getting odd results with supposedly OE quality pre cat sensors.

Bosch OE for me. That's the same for almost all of the parts I put on my truck. If I can get OE (not BMW that's a rip off) I'm going with that. Most of the aftermarket stuff seems to be made in China and is crap. I've heard nothing but bad things about URO parts. Won't use them at all.

I've used/installed plenty if Denso O2 sensors - not on a BMW though. Never had an issue with them. Even installed some "Denso" sensors for a chap at work once - he got them cheap on eBay from a large eastern country. At the price he paid, I doubt they were genuine but the quality looked ok and they installed and worked perfectly (in his Toyota Previa).

I have use both Denso and NGK (NTK O2 sensors). All worked as designed and the systems functioned properly without any issues.

I too have been contemplating an O2 swap... got a code for pre-cat 1.

Been looking at different options... can't see paying 270$ for BMW parts, when Bosch is literally less than half that per sensor. Denzo seems to be somewhat reputable.. not sure how they would do though.

I think Bosch is OEM, so no worries using Bosch.

Bosch is oe


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either way....

Yes, Bosch is OE for my 3.0i, so I used those for the upstream ones. I replaced at about 160k miles, soon after getting the car, when I foolishly thought I should be getting better gas mileage than I was. No change - no problems before or after. No change in MPG.

I've used Denso in other cars (e.g., Japanese ones) and I'd say the brand is at least as good as Bosch. So I'd use Bosch in my X5 and Denso in my Lexus, etc.

For my 3.0i:
upstream sensors = Bosch 13477
downstream = Bosch 15109
universal = Bosch 15738, for both upstream and downstream.

Yes, same sensor, different wiring socket (and a much longer wire for downstream) for up vs. downstream.

So I saved the (assumed good) original upstream ones I removed. Figure if I ever get a code on a downstream one, after swapping the two downstream sensors with eachother to confirm a sensor failure, I can splice in the original upstream one at least as a test.