2000 Sienna Check Engine Light On P1135

AutoZone pulled the code, P1135. It's something to do with Air/Fuel Ratio Sensor (bank 1, sensor 1). Any one knows what is it, where is it, and how to replace it?

Ok, here is what I learned.

The van has 3 sensors, 2 are A/F Ratio Sensor, mounted on exhaust manifolds, 1 is Oxygen sensor, mounted after the Cat.

Question is, which one is bank 1 sensor 1. I called many dealers, got contradictory info, some dealers say it the one close to the radiator, some say it's the one close to the fire wall.

And, even for the same dealership, different people told me totally opposite stories - the parts guy said it's close to the fire wall, the service manager told me it's the one close to the radiator and he said he is pretty sure there are actually 4 Oxygen sensors and I have to bring my car in so they can make sure which one is bad. Yeah, right, 4 huh, you either need training on the vehicle or you are just bullshitting trying to generate some revenue (he wanted to charge me $96 for just reading the code).

Well, from what I learned from the internet, I am pretty sure bank 1 goes with cylinder #1, which is the bank close to the firewall. So that sensor is called Bank 1, Sensor 1. The bank close to the radiator is bank 2, so that A/F sensor is called Bank 2, Sensor 1. And the Oxygen Sensor after the Cat is called Bank 1, Sensor 2.

Now, comes another problem, the parts dealer listed in their computer as B1S1 is actually B2S1 on my car. The part number is 89467-41011, this one has a yellow ribbon on the electric wire. The one on my car close to the firewall (B1S1) is 89467-41021 and has a green ribbon. The dealer I bought the part from is really confused. The parts guy said either their scheme is wrong or my car has the sensor installed wrong by the factory.

Guys,

Need your help. For those have 2000 Sienna, California emission, can you please open the hood and take a look. The sensor is mounted on the exhaust manifold, you can easily see it. Follow the electric wire, you will see a ribbon. Can anyone tell me what the color is?

Thanks.

www.boschusa.com lists the same part number for both sides and www.autozone.com lists the same, so I'm guessing that they look exactly the same except wire color. Good luck. (Sorry, don't have a 2000 Sienna.)

www.boschusa.com lists the same part number for both sides and www.autozone.com lists the same, so I'm guessing that they look exactly the same except wire color. Good luck. (Sorry, don't have a 2000 Sienna.)


Thanks JZ.

I had confirmed that the B1S1 is the one close to firewall and the part number is 89467-41021. Which is the part number on the bad one.

Apparently, either the van was installed the wrong part in factory or the dealer's parts system is wrong. Anyway, my problem solved.

I also have a check eng light code P1135. I foud the sensor close to the radiator and the one after the cat converter. where is the one near the fire wall ???l

I also have a check eng light code P1135. I foud the sensor close to the radiator and the one after the cat converter. where is the one near the fire wall ???l

It's between the engine and the firewall. On the other exhaust manifold.

It's between the engine and the firewall. On the other exhaust manifold.

I am a dumb ... what is the fire wall

Firewall is the "wall" that seperates the engine from the cabin from the bottom of the windshield to where the floor begins. I have to change mine out this weekend and the tips I got were to let the enging run at about 2500 rpm for 15 mins to heat the manifold. I plan on changing it this Friday and will Kroil (better than WD-40) the hell out of it tonight. Bank 1 Sensor 1 is the firewall sensor as per the Toyota techs. We'll see.:smile:

I Have a Sienna 2000, Bank 1 sensor 1 means that the A/F sensor is where cylinder 1 exhaust manifold comes out from, which in short is on the firewall side of the engine (back side). Hard to change cause of limited access. :crying:

Bank 2 sensor 1 is on the radiator side of the engine. The one that you see in front when you open the hood. Easy to change cause its right in front of you. :lol2:

O/2 sensor is the one in the back after the Catalytic converter. Not too bad to change. :p

Here is the definitive answer to your question. I have been through this and got it wrong at first. I had codes 1130, 1133 and 1135, which all indicated sensor1 bank1. There are three sensors on the 2000 Sienna. Two before the catalytic converter and one after. The sensors are made for Toyota by Denso. The first two are air/fuel sensors (I have a Calif. car, the sensors might be different for non Calif). and the one after the converter is an oxygen sensor. These sensors are available on line from Amazon cheaper than anywhere else I have found. One more source is http://www.densoaftermarket.com. They are less than half the cost of buying them from Toyota. The sensor 1 bank 1 (Toyota #89467-41021, Denso # 234-9007) is accessible from under the car on the driver’s side, near the steering column and is very hard to get to. Sensor 1 bank 2 (Toyota 89467-41011, Denso # 234-9009) is in the front of the engine, near the radiator and is very easy to get to. The one after the catalytic converter (Toyota #89465-08010, Denso 234-4623) is accessed from under the car, the passenger side. The plug for this one is under the front passenger seat. The seat is easy to remove with only four bolts (9/16"). The sensor is easy to replace.
That's it, have fun.

Thank you, this is an extremely interesting thread.
I have the OBD codes:
P1130 Bank1 Sensor1
P1135 Bank1 Sensor1
P1153 Bank1 Sensor2

Does anyone know of any step-by-step directions/diagrams for replacing these. I also am confused about whether to buy Toyota OEM parts or Bosch or Denso or another brand. I think the parts currently in the car are Toyota OEM with Cali. emissions standards even though I'm not in Cali. I've had all my previous work done by the dealer. I previously had a new oxygen sensor put in a couple years ago.

After more than 9 years from my first post here, my B2S1 is finally acting up. The error code is P1155. Why B2S1 lasts so long than B1S1?

Found my own post here and valuable part number info.

The part number imprinted on the original B1S1 sensor is 89467-41010. Which I learned is obsolete and the new number is 89467-41011. The equivalent Denso part number is 234-9009.

The difference between B1S1 and B2S1 is the length of the lead : B1S1 is 10.63" (270mm) long, and B2S1 is 13.78" (350mm) long.

Just ordered B2S1, 234-9009, from eBay for $72.

Will let you guys know how it goes.

For others, get your part number from a Toyota parts department using your VIN. You may be wasting your time installing the wrong sensor if you don't. You can buy it from Amazon or DENSO, but get the part number from Toyota and cross reference it to the DENSO part number on the DENSO web site. Search Amazon for the part using the DENSO part number.