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I just had an injector replaced on my '17 328dx at 16.5k miles.
The code I got was "24BB00/Intermittent: Zero-quantity adaptation, injector, cylinder 1: permissible filtered activation duration correction too high." I used a Schwaben OBDII reader to pull the code before bringing it to the dealership.
Like you, it came on, then went off after a few days. When it came back on a second time I brought it in. My dealership had no problem replacing the injector though, and I didn't hear anything about needing special approval. I dropped the car off before work, and picked up the same day.
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