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you are welcome to try replacing the oxygen sensor first but based on my years of experience only like .01 percent of cat codes are an o2 sensor. you will want to replace bank two sensor two o2 sensor which is on the front side of the engine. so if you follow the exhaust manifold from the cylinder head down it will be the oxygen sensor after the cat
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yes that is what i am saying that 99.99 it is the cat. yes bank two is the radiator side of the engine. i will pull up a diagram of the location if i can. but the exhaust should have a sensor up top on the manifold then one farther down the line after cat. the one after the cat is the one that monitors its efficiency.
you will see it label on the lower left hand side of this picture. it will say heated oxygen sensor bank 2 sensor 2
if you are to replace the cat i would still recommend replacing the o2 sensor since most times when removing the exhaust system the shock tends to disrupt them and you can end up getting a code for a heater circuit on the same sensor.
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