P0036 is bank 1 sensor 2, so that is the sensor after the cat to the rear half of the motor (the bank with cyl #1 is bank 1 and sensor 2 post cat sensor) Some manufacturers have a scheduled maintenance to replace, but I would just replace as they go. That is what I am doing. I had the same sensor go. Get it from GM they are reasonable and direct fit.
is there any thing i can do to test that it is actually the O2 sensor? i was reading something about swaping sensors and seeing if it throws a different code... if that seems like a good idea can i get some more info about swaping this one? and what one to swap it to... i've got decent mechanical abilitys, just don't know where i should be looking...
Without a tech 2 the swap test will work. Depending on your mileage, there's about a 99% probability that the sensor/wire harness assy itself is bad. Its a very hostile environment for an electrical circuit.
Just shy of 130,000 and i live in minnesota so its deffinitly a harsh enviornment.... thanks for the youtube link!!
Actually, I was referring to life in the exhaust pipe. FWIW, the last sensor I got was under 35 bucks at Amazon. At 130K I would just replace them all as they are due & you'll improve your mpg (as their switching gets lazy with age). Just a suggestion.
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