P0137 Code Diagnosed w/Homemade Test Harness. 99 Silverado

I kept getting a persistent oxygen sensor code (P0137) and all of the diagnostics were inconclusive. Other mechanics and techs kept suggesting that I remove the sensors and switch them side to side to see if the problems jumps sides. Not a simple task when the only good sensor is an original and questionable itself plus sufficiently seized in the pipe. In this video I show the end of the diagnostic process and what I did to confirm a bad sensor.
#chevrolet #silverado #chevroletsilverado #chevysilverado #autorepair #o2sensor #z71 #diymechanic #sierra #gmc #gmcsierra #carrepair
This is the scan tool I am using in this video - www.boschdiagn...
You can purchase the above scan tool here:
www.amazon.com...

[@AaronClodfelter-n7w]

Great video! Easy to understand. Thanks

[@papergatorzfedducca7998]

Would these cause poor MPG? Nice video!!

[@JunkMissions]

It's possible. Since using this means one side will be reading for the other then your computer could falsely think that conditions are normal when they aren't. Perfectly fine as a diagnostic tool or to confirm a diagnosis but I would certainly not drive with this on. Tricking your vehicles computer could result in mechanical failure.

[@Towelie45]

Dealing with this problem currently

[@eg7105]

so you happen to have bought 2 brand new faulty sensors?

[@JunkMissions]

Yes. Verified through testing. Not a very common occurrence I know. However about 6 months after I made the video the problem came back. I traced it to a ground fault in the harness. I was told by a GM dealer that persistent O2 sensor issues were the least of the problems those trucks had. Unfortunately (or fortunately depending on your outlook) before I had a chance to fix it the rotted frame on the truck gave way.

[@derekkchung]

I have to say u provided a lot of misinformation. Upstream sensors are for ECU to adjust fuel. Downstream sensors are for checking functionality of the catalytic converter and DOES NOT affect engine performance. Upstream fluctuates and downstream stays at above 0.5 if cat is good.

[@JunkMissions]

Very True. This was merely to give another way for those lacking expensive test equipment to easily narrow it down. Personally, engine lights drive me nuts.