P0156 02 Sensor Fail

[kennythewelder]

So as I posted in my thread (02 Sensors, Over $1000 For Sensors Wow!!!!!!) the up stream 02 sensors for my 2004 4 runner 4.0 L are very expensive, and no body has them. I know p0156 is sensor 2 bank 2 ,so rear sensor, and I can find the rear sensors. What do you guys think about just changing the rear (after cats) 02 sensors, and not doing the before cat ones ? Has any of Y'all done this?

 

[kennythewelder]

By the way, I have not been able to check anything on the 4 runner, because of the weather. I am planing on working on it this weekend. I did call my local dealer (parts dept.) and they said there techs only change the sensors that fail, and do not change them all. $222.00 for front, and 202.00 for rear sensors.

 

[kennythewelder]

I also have p2272 and p2273

 

[tbplus10]

I have heard of techs swapping the sensors and solving the problem you describe.
Also look long and hard at the sensor leads, they can be damaged easily.
A few years back a gentleman that posted under the forum name of "dick foster" on the "Toyota Tacoma Forum" posted a very comprehensive trouble shooting guide for the diy mechanic that was a spot on trouble shooting guide to solving this problem.

 

[toyotafan]

I'm not following. What do you mean to swap out the sensors?

 

[tbplus10]

On systems with dual pipes they swap the sensors from side to side, or in cases of universal sensors they swap from frt to back. Sometimes this solves the code problems.

 

[toyotafan]

On systems with dual pipes they swap the sensors from side to side, or in cases of universal sensors they swap from frt to back. Sometimes this solves the code problems.

<Scratching head> ... so hoping that only part of the sensor is dead and that it will work properly on the other side?

 

[tbplus10]

Sometimes just removing the sensor will knock off carbon and allow it to read properly, at least that's the best theory I've come up with for this.

 

[kennythewelder]

I plan on pulling the rear 02 sensors soon. I cleared the CEL for the 2ed time, and it has not come back on, yet, but we don't drive it much. I think it may be a carbon issue, but with the rain last weekend, and the cold this weekend, IDK when I will do this, but when I do pull the sensors, I will clean them, and reinstall them. If this does not work, then if the CEL trips again, I will replace the rear sensor, or maybe both rear sensors. The 4 runner does have some carbon, we don't drive it much. Sense I had a po2272 and po2273 low voltage, and high voltage, carbon may very well be the issue. Once I pull them, I will post the results.

 

[kennythewelder]

Well I finally changed my o2 sensor tonight. I test drove it for about 20 miles and all look good. I called Oriley's at lunch today, and they said they had a Denso sensor for 68.95, I said grate, put my name on it, and I will pick it up after work. I go there after work, and guess what. The moron I talked to at noon had left for the day, so the ast. mangr. looks it up and no sensor at all in the store that fits my 2004 4 runner, and none anywhere with in a 30 mile radius. He calls Advanced, same sh1t. I had already pulled the old sensor, and did not want to put it back in, so I go across the street to Autozone. The only thing they had was a Bosch. So I said well I guess I have no choice, give me that one. I know the girl who waited on me, and she says, if it gives you trouble, I will take it back.

 

[tibadoe]

I hate when that happens...........

 

[toyotafan]

What's wrong with customer service today? Seems like this is happening all the time across all sorts of businesses.

 

[kennythewelder]

Yea, my wife is happy. The 4 runner is running very good. The new dash looks grate too.