Toyota Tundra Forums banner

1 - 19 of 19 Posts

·
Driver of 2 Tundra trucks
Joined
·
6,301 Posts
Discussion Starter #1
OBII shows P0161 B2S2 H02S malfunction.

Is this a DIY repair with simple tools or should I let the local shop do it for $220.00?

Thanks.
 

·
Premium Member
Joined
·
782 Posts
I think that is the rear, passenger side sensor. Unless it's really rusty or seized up, it should be cake. Mine took about about 15 minutes, including gathering the right wrench, etc. A standard wrench should suffice. Be sure and put the right Denso in it.

Judging by your sig, you and I would get along great.
 

·
Premium Member
Joined
·
6,857 Posts
bank 2 is pass side. sensor 1 is the front; sensor 2 is the rear
 

·
Premium Member
Joined
·
782 Posts
Yep. Not sure about local prices but if memory serves, I paid about 60 bucks online. If it's much higher locally, try sparkplugs.com, rockauto.com, or amazon.com.
 

·
Premium Member
Joined
·
6,857 Posts
So the malfunctioning O2 sensor on my truck is passenger side rear?
Yes it is. Can't remember the codes for Bank 1 (driver side) but almost positive the 161 is pass rear.
 

·
Moderator
2015 Toyota Tundra DC SR5 5.7L
Joined
·
8,540 Posts
It is highly suggested that you replace the oval metallic gasket as well as the mounting nuts when replacing the rear oxygen sensors. If they didn't come in the box with the replacement units, get them from the dealer.
 

·
Driver of 2 Tundra trucks
Joined
·
6,301 Posts
Discussion Starter #10
It is highly suggested that you replace the oval metallic gasket as well as the mounting nuts when replacing the rear oxygen sensors. If they didn't come in the box with the replacement units, get them from the dealer.
Roger that. I ordered the mounting nuts and the new sensor comes with a new gasket. Thanks.



QUESTION: Will the Check Engine light turn itself off after I replace the sensor or must I do something else to turn it off?
 

·
Premium Member
Joined
·
765 Posts
QUESTION: Will the Check Engine light turn itself off after I replace the sensor or must I do something else to turn it off?
You only need to disconnect negative terminal from battery for like +10 minutes and this will reset the CEL or go to autozone, but easier to disconnect(at the same time as you do sensor) Spray PB Blaster for couple days for easierremoval. Even though i did that and heated up the exhaust before removal , i still stripped threads and had to tap threads on the bung. Pain in the @ss as i did the passenger side front sensor. Take the torch (like the one plumbers use) and heat it up until its red hot, cool ti down and again. They have this "FREEZE OFF" thing in NAPA (should help) - that helps to free up the seized sensor/bolts. Don't rape it and don't pull out BFPP (big f****ing piece of pipe) as you only will twist those nuts off. The you will have to go to the shop or drill and tap to put new stud in. Been there and done that and believe me its no fun. Take your time. Don't try to muscle trough things as them old bolts will fail and then you'll be in trouble like i was (twice :D)

Look here at my case http://www.tundrasolutions.com/forums/1gen-tundra/185566-disaster-during-o2-sensor-removal-need/http://www.tundrasolutions.com/forums/1gen-tundra/185566-disaster-during-o2-sensor-removal-need/
 

·
Driver of 2 Tundra trucks
Joined
·
6,301 Posts
Discussion Starter #13
pass rear for the 4WD models is 234-4162.

Here's the breakdown:

234-4154 = 2wd Rears and 4wd rear left
234-4162 = 4wd rear right
234-4169 = Front sensor for both 2wd and 4wd V8
Thank you for the breakdown, I had already ordered the 4154 and went ahead and ordered the 4162 after reading your post.
I will return or sell off the one I don't use.

You only need to disconnect negative terminal from battery for like +10 minutes and this will reset the CEL or go to autozone, but easier to disconnect(at the same time as you do sensor) Spray PB Blaster for couple days for easierremoval. Even though i did that and heated up the exhaust before removal , i still stripped threads and had to tap threads on the bung. Pain in the @ss as i did the passenger side front sensor. Take the torch (like the one plumbers use) and heat it up until its red hot, cool ti down and again. They have this "FREEZE OFF" thing in NAPA (should help) - that helps to free up the seized sensor/bolts. Don't rape it and don't pull out BFPP (big f****ing piece of pipe) as you only will twist those nuts off. The you will have to go to the shop or drill and tap to put new stud in. Been there and done that and believe me its no fun. Take your time. Don't try to muscle trough things as them old bolts will fail and then you'll be in trouble like i was (twice :D)

Look here at my case http://www.tundrasolutions.com/forums/1gen-tundra/185566-disaster-during-o2-sensor-removal-need/http://www.tundrasolutions.com/forums/1gen-tundra/185566-disaster-during-o2-sensor-removal-need/
Thank you and I have read that disaster post...
 

·
Premium Member
Joined
·
2,702 Posts
When I went to change my rear O2 sensors the nuts were so fragile on one
side they kept rounding off. I was able to get the other side off, but on one
nut I used an 8mm socket to get it off and on the other a 10mm socket.
I was curious to know what the actual size of a new nut was and it turned out
to be a 12mm nut I believe.

Anyway, if you run into rounding off problems a nice little set to have on
hand is the Craftsman Bolt Out. I used it to remove the other side which
kept rounding off and it worked great.

Also, before putting the new nuts on, which seem cheesy to begin with, I
put a little anti-seize on the threads and I also put some over the nuts once
I had them tightened down to sort of put a protective coating over them.
I live in the northeast so we get a lot of snow and ice which means plenty of
road salt, leading to corrosion. Good luck.

John
 

·
Driver of 2 Tundra trucks
Joined
·
6,301 Posts
Discussion Starter #15
# 234-4162 is the correct O2 sensor for the rear right of my 4WD...
they forgot to included a gasket as advertised/pictured in their ad :(

I have the new nuts and I will have a new Toyota ga$ket this Thursday.
 

·
Premium Member
Joined
·
6,857 Posts
# 234-4162 is the correct O2 sensor for the rear right of my 4WD...
they forgot to included a gasket as advertised/pictured in their ad :(

I have the new nuts and I will have a new Toyota ga$ket this Thursday.
Mine didn't have the gasket as well. Got mine at the dealer for around $7. they said it was a common gasket they carried.
 

·
Registered
Joined
·
36 Posts
I experienced the same thing using a smaller sized socket to get them out. I ended up taking almost an hour to do mine. But I heat cycled the nuts with map gas about 3 times before I started to try to get them out. Ordering new nuts and a gasket was a good call.
 

·
Driver of 2 Tundra trucks
Joined
·
6,301 Posts
Discussion Starter #18
The seller AutoLineParts refunded what I paid for sensor #234-4154, all shipping
cost and the cost of the gasket my local Toyota dealer should have today.

Kudos to the folks at AutoLineParts and Amazon.com.




I should have everything bolted into place later this afternoon :cool:
 

·
Driver of 2 Tundra trucks
Joined
·
6,301 Posts
Discussion Starter #19
It took about 10 minutes to swap out the O2 sensor and all is well with my Gen 1 Tundra once again.

I thank all of you for your help and suggestions :headbanger:
 
1 - 19 of 19 Posts
Top