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So the weather has been great in NY, and I haven't touched my car since Saturday, have been riding one of my motorcycles, and my wife has been driving my car instead of hers because it's more suitable in the winter.
Meanwhile, I had ordered the lower CCV hoses and two pre-cat O2 sensors. The order arrived early this afternoon, and soon as my wife got home from her errands I went out to change out the O2 sensors. I first went to start the car to erase the code, and lo and behold, the CEL was off.
Connected to Bimmerlink, read code memory, it shows 2C21 and 2C2C but says the fault has not yet occurred. I hope that maybe after I replaced the spark plugs and upper CCV tubes, it took the ECU a while to adjust the long term trim, and now the CEL is off for good.
I still replaced both O2 sensors, just because - after 109k miles, might as well. My wife is driving my car to VA tomorrow and back next week, hoping the CEL stays off.
P.S. When I took out and swapped the old O2 sensors from side to side, I cleaned them up with sensor cleaner. When I took them out today, they were covered with black soot, just like when I first took them out. I assume this is normal and to be expected.
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