Log it, you'll see if anything is out of whack..FWIW I got a P29E1 after using too aggressive an E85 mixture not long ago, cleared the code the next time I filled up with 93 pump, and has yet to return. The car drove fine with the code, though I had cleared it and filled back up within 48 hours of pulling it from Cobb.
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E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII
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