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I have an e46 with a service engine soon light, I have gotten it diagnosed and it appeared to be an 02 sensor code. I have swapped a few parts and was wondering if someone could try and clear the code for me now. I am just a bit north of SD not looking to travel too far.
 

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I'm betting it was a P0171/P0174 as that's what most people relate to being an oxygen sensor. It isn't, it's a vacuum leak. You do a smoke test and fix wherever smoke comes from https://youtu.be/AsgB9eBl58I
The code should clear by itself if you fixed the issue after a few drives
 
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