I am replacing my B2S1 Air/Fuel Sensor due to a CEL code P1153 (IIRC).

I pulled out the old sensor and it looks physically different. I also don't know if it's the original part - it doesn't look very old and it says it was assembled in USA.



Here are the markings from both sensors:

New Denso Air/Fuel Sensor
Assembled in USA
192400-8070
03N29

Old Denso Sensor
Assembled in USA
41380
04H18

I ordered the new sensor from Amazon. The Denso part number is 234-9009.

I was told by the dealer(gave them my VIN) that my car has California Emissions Air/Fuel Sensors.

Need an answer ASAP.

 

I originally used Densoaftermarket.com as a reference for part numbers. I just found another website called Densoproducts.com and it has a more thorough catalog. According to this website, ES300's without California Emissions use a different part (234-4622). I looked up images on amazon for this other part number and it looks just like the old sensor that I removed(with many holes).

I'm curious to see what my B1S1 sensor looks like.

Maybe somebody replaced my front oxygen sensor with the wrong part and thats why its been throwing a code once in a while? I smell gas on cold starts, for brief moment. So I don't know if I'm polluting due to a bad sensor or bad injectors.

Would I cause any electrical issues if I put my new sensor in?

 

Looking at a few pics of the Denso parts, the one with less holes looks like an air/fuel ratio sensor. So if your car is Cali spec, then your replacement looks to be the correct part.

edit --- here's what I mean.

This is an air/fuel sensor


This is an oxygen sensor

 

You are correct. Four to five hours later, I have solved the mystery.

This was a real test of my patience, but here are the results:

The B1S1 sensor was the original Toyota part, so I was able to prove my theory. The Toyota part looked just like my new Denso 234-9009 Air/Fuel sensor. The markings read Toyota 89467-41020, which match the California Spec part number.

I decided to put my new Denso sensor in the back (firewall), and I put the used Toyota sensor in the front (radiator). This way, if I will need to replace the Toyota part, it will be much easier.

Here is a pic of the B1S1 sensor that I pulled out. I can't even explain how excited I was when I finally got it out. The sensor tip is actually gray, it's the camera that makes it look brown.




p.s.: Anyone who needs tips on removing the rear sensor, shoot me a PM.

 

Hi I have un connected the eletrical connector for b1s1 sensor, but have trouble to remove the nut, is counter clockwise to remove it? tried with different liq like deep creep, pb blaster, and even try to start the car for 10 min. still doenst work, any idea?

Thanks

 

Frank, welcome to ClubLexus. I have noticed that you have been posting the same sentence in multiple threads - that is considered spamming. I have already answered your question in one of them, so I would advice that you go back to that one.