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 | Sparkling Graphite Metallic | VRSF Downpipe | JB4 G4 | Mr. 5 Intake | 50/50 e85/91| Alpina B3 TCU Flash | NGK 5992 Plugs | More to Come...?