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Discussion Starter · #1 ·
'05 Tundra 4.7L threw code P0156. I replaced the Bank 2 Sensor 2 with a new Denso and did a reset. Code threw again. Is there a chance that the new sensor was faulty? The voltage tends to stay high (.8-.9)on that sensor while in operation. I say tends because it does not fluctuate as much when compared to B1S2. I have checked connections locally at the sensor and all seems clean and snug. Thoughts or comments greatly appreciated.
 

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My 2000 4.7L Tundra got the same code a few weeks ago, I replaced that O2 sensor and within 50 miles got the code for the sensor on the opposite side (can't remember that code # at the moment). I found it hard to believe that they both went so closely together, but after replacing the second one all is good now.

Just thought I'd toss this out in case you might be looking at the same thing. Good luck.
 

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Discussion Starter · #3 ·
Thanks for the comments jdub01. Well, I have elimated the thought of a "fault" new Denso part. I swapped both Banks Sensor 2's to see if the problem/code followed. After the swap I cleared my code. After 3 runs about 50 miles the same P0156 code flased. I believe it is either a loose connection or possibly the Bank 2 Sensor 1 being the issue. I read in some older post that Sensor 1 could cause the #2 sensor to throw a code. I'll post after the next find or repair.
 

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2015 Toyota Tundra DC SR5 5.7L
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The Bank 2 Sensor 1 replacement corrected the issue and code. Odd that the sensor 1 can cause a malfunction code for sensor 2.
They work together. Remember, they are very sensitive to voltage, so I've seen a bad negative ground screw up O2 sensor readings.

Glad you got it figured out.
 
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