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Yesterday, I went to get a custom cat-back exhaust put on my car. After all the 2 14" piping was installed, I started looking and could not find the 2nd O2 sensor. I thought there was supposed to be two O2 sensors: one before the cat and one after. I asked the installer and he said that I only had one and showed me the one right before the cat. That one was like maybe 3 inches in front of the cat. There is supposed to be two sensors right? If so, where is the other one. Any help would be appreciated.
Thanks

Updated: I figured it out. What I thought was a second cat was actually the resonator. Just ignore my post.
 

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The first sensor is about 6-8" away from the engine down the exhaust pipe The O2 sensor they found is the 2nd O2 sensor.

I suggest you go to a different shop in the future if they could not figure that out....

Leave it to Random to Needlessly complicate things.
 
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