I have been getting a code P1153 which indicates a malfunction in the Bank 2 Air/Fuel Sensor(the one near the radiator). I forget the official wording, but I believe it has to do with insufficient switching.

Now I have learned that only California Spec cars have Air/Fuel sensors. My car was bought and always lived in NJ (as far as I know). How can I know if I have a Calif. Emissions Vehicle and how do I tell a difference between an O2 and an Air/Fuel Sensor?

I tried looking around the car and found this sticker on the underside of my hood. Does this mean anything?



Weird thing is, my gas mileage has always been around 23-25, depending on how fast I drive. So that hasn't suffered and proves that the car isn't running rich.
The only other thing I noticed is that my car has a very strong exhaust smell. Not sure if it's only on cold starts or all the time, because I try to not idle the car for too long.

Would you recommend a sensor diagnosis or should I just bite the bullet and replace it?

Give me your VIN and I'll tell you. Cali Emisions use both AF and O2. The manifold ones would be AF.

And your sticker on the hood says CAL.

89467B SENSOR, AIR FUEL RATIO
89467-41020 REAR


Should be it

VIN sent.

Are you sure it's known as the Rear sensor? B2S1 is the one at the front of the car near the oil filter.

edit: Going off of Sewell's Website.

Bank 2 Sensor 1
SENSOR, AIR FUEL RATIO
Replaced by: 89467-41011 89467-41010
Manufacture notes: CALIFORNIA SPEC,FRONT

Brain is ****ed, sent you a PM back.

I reversed them in the PM as well, but explained it all.

I understand that an Air/Fuel sensor is basically an improved O2 sensor. Now is it the same as having Platinum or Iridium spark plugs? Or is the car programmed to only accept one type of sensor?

Say for example that my car was built with O2 sensors and I replaced them with Air/Fuel ones. Would I cause any issues or would it actually be an improvement and lower my emissions? Can the car's computer run on either one?

Won;t work, the sensor sends a different signal. You;'d have to change the ECU. Beyond that, I don;t know the spoecifics as I'm not that good on electrical. I'll ask one of the techs at work tomorrow about the code, as they often know off the top of their head which codes mean what on certain engines.

Air Fuel ratio sensors are only designed for upstream, not downstream. So your case, your car got 2 A/F ratio sensor for upstream and 2 oxygen sensor for downstream. The difference is A/F ratio sensor is a wide band, faster response, car goes into closed loop within seconds compared to the oxygen sensor. If you decide to put an oxygen sensor instead of and A/F sensor, that oxygen sensor will be burnt. The heater circuit on the A/F sensor uses high amps compared to the oxygen sensor. Be wary

Now I am confused. I thought there were only 3 sensors in total - one for each bank and one after the catalyst. Is this incorrect?

The image is from a 1997 FSM




p.s.: I'm a complete newb when it comes to O2 and A/F sensors. Does "upstream" and "downstream" just refer to the location of the sensor?

Oh wow just realized, you got almost the same problem as me

Recently, my CEL lighted up. Checked it out. It is code P1135 and P1155.

basically, Bank 1 sensor 1 and Bank 2 sensor 1 went bad.

And my car is California emission after multi-confirmation from lexus dealers.

I am a student and i dont have over 550+ bucks throwing to lexus dealers instead I am trying to buy parts online or from local dealers.

The air fuel ratio sensor actually varies so much. Give me so much confusion.

Can anyone help out here?

Get them from Sewell Lexus. They offer a discount to ClubLexus members, but you have to create a free account first. I know for a fact that B2S1 is $148, and B1S1 is $170. It gives you a different price once you log in.

http://lexus.sewellparts.com/accesso...1998/5382.html

This is the part I do not understand.

1998 ES300 has 4 Sensors for this part of problem

2 Air Fuel ratio sensor(both located nearby the engine) and 2 oxygen sensor.

When they are asking whether it is front or rear for the air fuel ratio sensor, it confuses me so much.

When they say Rear air fuel ratio sensor, is that indicated the oxygen sensor at the back of the car?

Also, for the parts number, do 89467-41010 and 89467-41011 have any different?

Oh wow, really? My local dealer gave me B1S1 and B2S1 as the same price? Now I am totally confused. What is the different inbetween them

My bad. Your car has only one oxygen sensor, which is located after the cat. Upstream is before the cat and downstream is after the cat.

The part numbers are different for Bank 1 and Bank 2, so they are not the "same" in the Lexus system. They could actually be exactly the same, it could just be a Toyota pricing scam.

Toyota often changes its part numbers whenever they alter the part or when they just feel like it - I don't know.
89467-41010 is the original part number - no longer being sold.
89467-41011 is the current one.

Hope that clears up any confusion. I also responded in your other thread.


EDIT: I looked at the B2S1 sensor. It was hard to read the markings because I had to use a mirror.
Denso Made in USA
41380
04H1B

I also don't know if the sensor is original, because of how many owners it had.

Its common that the sensor goes bad on these cars. Go ahead and change the bank 2 sensor 1.