I've got The same code..but only as of last night. 40/60 mix of e85/91 and wot in 3rd and I missfired ...threw the code 29F3 directly after. Now I'm having issues wot in any gear. I might have some bad e85..or maybe I should add some more 91 to my mix to dilute the e85. Could this be a failing lpfp rather than just a failing sensor?
'08 E92 335i Pre-LCI | SGM | PTE 6062 VM ST top mount conversion | Alpina B3 TCU Flash | Fortune Auto 500 w/ 8k/11k Swift Springs | 28mm ECS solid FSB | M3 Front and Rear Control Arms w/ Rogue Adjustable Toe Arms | 18x9.5 et22/18x9.5 et35 Arc-8's wrapped in 275/245 NT05's | VRSF V2 catback exhaust | Poly transmission mounts | Solid aluminum subframe bushings | A front bumper that looks like I waxed it with 5 grit sandpaper..