Ugh.... yall the dreaded code appeared. I always thought the exhaust on these things are something awful. But... I did see a video of installing a 02 sensor elbow but did hear that if you tried to get an emissions test it will fail it. But.. to remove it and drive it 1-200 miles. I did clear the CEL/Code to see if it pops up again, I know I was quickly accelerating when when I saw the CEL come up. Would it still be ideal to take it in to get a clear diagnosing before attempting to do the 02 sensor elbow? I know a CAT will cost $$$$. If that elbow does the trick, I would rather spend 100 than 2K on a 06 prius. I did read some interesting comments like the oil seal/chamber wasn't clean, air leak around some other part, etc.. and wasn't the CAT. What are your thoughts? Thanks in advance