What code were you getting? P0420? And what parts have you replaced so far? The Catalytic converter gets to a very high temperature to burn off and convert any excessive emissions gases before leaving the tail pipe. I'm not sure where you live, but the outside ambient temperatures have been very high lately, so you might see the code come back at some point. Some codes need to have a certain number of faults occur and/or key cycles before a code is stored. Is your scan tool capable of reading live engine data? If it can, take a look at just the engine data while the engine is running. Look at the data PIDs for Long and Short Term Fuel Trim (LTFT, STFT). Those numbers will be either positive or negative, so for example +10% or -10%. If you see anything over 10%, that's when the computer is starting to compensate a bit too much for a problem, or what is thinks is a problem. If the code is not coming back right now, and you feel the vehicle is running pretty smooth, you don't notice any rough idle or lack of power, then check the Fuel trims, if your scan tool can't, see if AutoZone or another auto parts store will pull up that data for you. It will give you an idea of how the engine is performing right now. Quite a bit changes with the seasons, it takes more fuel to run a cold engine than it does a hot one, because of air density. So if you got the oil leak fixed, and its running okay, I wouldn't worry too much until the Check Engine light comes back on, but knowing the fuel trim numbers can help us see if the engine is on the more lean or rich running side of things, I think you'll find when that Catalytic converter code comes back, the fuel trim numbers will be negative more. And it's good that you always get a second opinion before changing out parts, many people will just keep changing out parts until something is fixed, but that gets very expensive fast.
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Friday, July 28th, 2023 AT 11:45 AM