Replace Bank 1 Sensor 2 2005 Sienna

I got a P0037 code which is the Bank 1 Sensor 2 O2 sensor. What I need to know is exactly how do I get to it. I know that it is roughly near the firewall on the drivers side but how do I get to it. Under the car? Do I have to take other parts off to get to it? Any help appreciated.
Regards,

Mfdpa.

Hi mfdpa,

I think you mean code P0137, which is Bank 1 Sensor 2. This is the after cat heated O₂ sensor on the firewall head. This is an easy replacement, although a stealership will likely charge you $50-$100 labor, plus huge $$$ for a Denso sensor when the aftermarket Bosch is cheaper and most likely superior in design.

If you pull your van up on ramps, you can slide under and find this sensor. It's located right above the exhaust 'Y' pipe where the 2 heads are exhausted together. If your van is AWD, the rear driveshaft will be partially blocking your view; this is not a problem, you can still reach it. Now, you will notice that just after leaving the sensor, the wire is clipped to the undercarriage (to keep it from snagging on the road, rear driveshaft, etc.) and then it goes through the sheet metal near the left front tire via a grommet. Gently pry the plastic wire clip out (use a small screwdriver) and try to save it for use on the new sensor; it's designed much like a toggle bolt and held to the wire with a short zip-tie, which is easily removed once the old sensor is out. The wires then go through the grommet and reappear inside the passenger cabin. Open the driver's door and put the driver's seat all the way back to give yourself some room. Now, remove the small plastic kick panel immediately to the right of the accelerator pedal. It has one push clip near the firewall and 2 hidden edge clips where it connects to the main console kick. Remove the push clip and disconnect the 2 hidden edge clips by gently pulling the small panel toward the firewall. Once the kick panel is out of the way (you may need to pull the edge of the carpet back a little) you'll see the other side of the grommet. The connector pigtail is just above the grommet (you may need to twist your head up in there to see it, but follow with your fingers - it's there, mounted to the metal console frame). Gently disconnect the pigtail but pushing the lock. Now push the grommet, wire and pigtail through to the underside. Turn out your old O₂ sensor (7/8" open end wrench works well, if not seized from heat) and your old sensor is out. Installation is the reverse procedure. Don't forget to put anti-seize on the new O₂ sensor threads (if not already on from the factory), and to untwist the wires after you turn it in.

Good luck!

Shrewsbury

Just wanted to say that Shrewbury's instructions were exactly right and it took less time to replace than it did to go pick up the part. It was also less than half the cost.

I do not have ramps but I could easily reach it by driving the driver's side front wheel up onto the curb next to my driveway.

Thanks again.

Sienna B1S2 location, connecter location, B1S2 O2 sensor pictures

2005 Toyota Sienna FWD, 90,000K.
I got a CEL , VSC and TRAC OFF (3 orange lights) on at the same time after I drove the rough road. The CEL will trigger the other two lights on.
P0037 is B1S2 , part number is 89465-08030 (it comes with anti-seize on the new O2 sensor threads). It costs about $150 from dealer.
I disconnected the battery and unpludg some fuses. This time, it came out P0037 plus P0102. After I change the O2 sensor and clear the code, all lights are off.
You can fix by yourself.
P.S
The last fuel tank before the check engine light on . I used LUCAS fuel inector cleaner. But this is not the first time to use.

The Part Number referenced above is only for the FWD. The All Wheel Drive (AWD) uses one with a slightly longer cable, which is part # 89465-08051

Good info !
But I would definetly use a Denso or Toyota part.

(IMG:style_emoticons/default/liebe011.gif) Great info, thanks, I also appreciate the photos! The comment about it taking more time to get the part than to change out the sensor is very true. Just so I feel I can add something to the discussion the part number for the Bosch for the 2004 AWD is 15620, thanks for the help, no more check engine light is a good thing!

Hello Guys,
This thread is definitely help full. I too have an O2 sensor that needs replacement. 2011 Toyota Sienna B1S2. I know this is same ones in those pictures, after cat.
But when ordering the stores refer to them as upstream/downstream catalytic and left or right of catalytic. So I know that it is downstream of catalytic. I don't know if it is left or right because I looked under the car and it is on top and can't really differentiate if it is left or right?

Can anyone help?

thanks,
Joseph

Okay, my research shows the left or right deals with bank. But still dont' know if bank 1 is left or right? It doesn't help that the engine is sideways.


Joseph

Completed this job Sunday thanks to the details on this post. I used liberal liquid wrench and the split socket set from Autozone. I used ramps which, when combined with the AWD in the way, gave me a very poor mechanical advantage. But persistence paid off, just kept lightly striking the breaker bar and spraying and eventually came loose. If I had an open ended 7/8 wrench I think it may have worked better. Thanks for everyone's posts and pics.