*DIY* P0161 O2 sensor B2 S2 change (pics)

[James_F]

Yeah still the same code. Is there any difference between which ground gets which ground being as there are 2 black wires? I will mess with the wiring one more time but maybe I should just get a 30 dollar 02 sim rather than buy an OEM toyota one.. not sure.

[mickificki]

do u know the part # for the toyota OEM sensor u ordered?

Originally Posted by PROLIFIK1

^ Are you still getting the same P0161 code? I just fixed mine and replaced it last weekend. I also checked the y-pipe and b-pipe for any exhaust leaks and did find them pretty loose (guy who installed it didn't seem to tighten it) and been running for a full week now without a CEL.

Maybe it can all be in the wiring/soldering. Sometimes they're just effed up. I didn't want to hassle with that so I ordered a new Toyota OEM one instead to save the troubles.

[PROLIFIK1]

^ Here it is 89465-53190. Sad thing is, there isn't a Toyota alternative meaning you can only get it from a Lexus dealership. Unless someone happens to go through all the Toyota ones finding the same sensor with the same length and plug.

I ordered mine off OELexusparts.com. It was only 121 with free shipping and no tax. Dealerships here in SoCal wanted 160 plus for this damn sensor.

[mickificki]

thanks! +rep!

Originally Posted by PROLIFIK1

^ Here it is 89465-53190. Sad thing is, there isn't a Toyota alternative meaning you can only get it from a Lexus dealership. Unless someone happens to go through all the Toyota ones finding the same sensor with the same length and plug.

I ordered mine off OELexusparts.com. It was only 121 with free shipping and no tax. Dealerships here in SoCal wanted 160 plus for this damn sensor.

[mickificki]

great thread.

question, is this also good for the P0057 error code Bank 2 Sensor 2 Heater?

does anyone know?

[PROLIFIK1]

^ There is the cheap alternative way other than actually replacing the sensor and getting rid of the cel but it requires messing with the wiring in the engine bay.

Here's the thread to read more about it. I was going to consider this route to fix mine, but I really didn't want to mess with any of the wiring yet.




Hope that helps.

[808IS3]

gonna bump this up!
being as i've been getting the dreaded P0161 (B2S2) error code and after erasing it several times it just pretty much stays on by now. the first time the cel popped up and i erased it the car was fine for several months, thou by now the cel always comes back after a hour or so of driving.

so, i will tackle this sometime next week or the following week once i figure out where i'm going to get the o2 sensor from. hopefully carson toyota (ltunedparts.com) has it in stock and its at a good price as well.

oh and for the people that have done this with the OEM o2 sensor, how did you get the connector into the cabin? i'm guessing the rubber grommet is too small for the connector to fit thru? or does it actually fit?

anyways from the directions in this awesome diy, i'll hopefully end up saving myself some cash.

and as far as just splicing the wiring in the ECU, well i thought about doing that for just a simple fix but the more i thought about it and after reading this diy in detail it really seems like this isn't that hard to replace. well considering i actually haven't tried to do this yet, so we'll see
but yeah, i suppose actually replacing the sensor vs. splicing the wires in the ECU is just a matter of cost. for me, it's not that big of a cost, and considering it would cost about $350 or more at the dealer to fix... it's still a better choice in the end.

[808IS3]

okay i got my OEM O2 sensor from carson toyota last week and just replaced the whole thing today! took about 2 hours or so. incidently it cost me about $128 total shipped to hawaii! thanks again steve! oh yea the oem sensor has a little anti seize paste on it already thou i did apply a lil more just in case.

couple of things i'd like to add... i chose to go with the OEM sensor since it all plug & play, comes with the connector and plug for the hole in the chassis.

taking off the seat is more or less straight forward if you've ever wrenched before. the 2 front bolts are easily seen while the 2 rear bolts have a cover on them, the pop off easily.

okay once you have the 4 bolts off then separate the 2 connectors underneath the seat... either have someone hold the seat up for you while you figure out how the connectors separate or... do what i did, hold the seat up with one hand and with the other try to separate the connectors!
oh take out the seat completely as it will make life a whole lot easier.

okay once your seat is out of the car, you gotta disconnect the connector for the O2 sensor! for those don't exactly know where it is... well the connector is to the left of the black plastic vent close to the center console. and if you follow the wire the hole is towards the back seat.

from here its just like said in the first post, jack up the car and use your universal O2 sensor tool (all the o2 sensor socket tools should be 22mm in either 1/2 or 3/8 drive and 1/2 being more common) and simply take off the sensor. now for me i used wd40 and it was a little tough for me to actually take off the sensor. maybe liquid wrench would make life easier but all i had was wd40 and i figured that would be good enough. also the fact i only used a jack to get under the car (not the smartest thing to do i know) and not a jackstand and obviously an actual lift would be the greatest as that would give you the most access to the sensor.

okay now that everything is disconnected just pull out the whole sensor assembly from the top in the cabin. but before you do that take off the cover underneath the car thats covering the hole to the cabin, about 3 nuts or so to take off. you don't actually have to take the plastic cover off but it makes the wire more visible.

and just reverse your steps and voila!
after that i just started up the car again and cleared the code, hopefully it won't come back again. and since i only have a basic OBD scanner i can't check to see the o2 levels from the sensor.

well in the end i'd rate this a 4/10 in difficultly for anyone wanting to do this repair themselves. in the end i figure i saved myself about $150. and gave myself a couple of nick as well

[mochee_garage]

bookmarked. good DIY~!

[stan86]

Hm.. I did this like about 1.5 month ago, and I didn't take out the seat.
Since we know the sensor connector is at the left side close to the center console, just reach in from the big hole on the carpet made for the vent. The vent comes right off so you can easily reach the connector and unplug it, same thing when you try to plug it back in.

[Lexus_Rider02]

Gee Thanx! This Will Shurely Help Me!
Ur a Good Man By Posting this Up For Us New Owners! ^_^

[mickificki]

i just changed out the b2s2 sensor with an oem one...the tutorial was super helpful! it took about an hour total...

one note, after taking out the seat, u might want to pull out the plastic vent that sits under the seat. just pull it out. it'll give u easier access to the sensor clip.

[Dark2JZ]

Originally Posted by PROLIFIK1

^ Here it is 89465-53190. Sad thing is, there isn't a Toyota alternative meaning you can only get it from a Lexus dealership. Unless someone happens to go through all the Toyota ones finding the same sensor with the same length and plug.

I ordered mine off OELexusparts.com. It was only 121 with free shipping and no tax. Dealerships here in SoCal wanted 160 plus for this damn sensor.

Here's the trick. They usually special order them, and Toyota dealers order parts from the same warehouse that Lexus dealers order from. A part number is a part number to a Toyota parts guy.

[PROLIFIK1]

^ Weird, I have friends and family that work at several Toyota dealerships and the part number I gave them for the part I ordered a few months ago didn't show up in the system. I'm sure Toyota has the same part, but Lexus re-numbers the products I assume. It was just a hassle for my buddy to go through the parts trying to find the same part.

Would of been nice to have the number though so I could of saved some money on it.

[Dark2JZ]

The part numbers that Toyota dealers get do not intail the numbers for Lexus-only parts, but a parts tech can just put in a Lexus part number, and the warehouse will ship that part if they have it in stock.

Here's an example. The flywheel bolts for an IS3 are the same as 98 Supra TT 6spd, even the part number is the same. No problem for a typical "by the book" Toyota parts pro. Here's a kicker... the waterpump for an IS3 is a Lexus-only part. Give the part number for the waterpump to a "typical" parts pro, and he'll send you packing to a Lexus dealer. If you are dealing with a good parts pro, he will check with the parts warehouse and go through ordering everything manually; anything to make sure you get what you need.