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I had a pretty similar problem. I put in e85 a few times and ran it on map 5 and the car would pull extremly hard but then I began to get some codes, my SES light would come on, and some times I would only boost up to 5. I would also get serious misfires. I got a code (2D0D) for my o2 sensor bank 1 sensor 1 having a problem so I'm going to buy a new one. My dealer said he's never seen a the bank 1 sensor 1 sensor broken on an n55 so I'm not sure if its just a false code (not sure if they have those or not). Pretty just I have a cracked chargepipe as well so I'm buying a new one.
Did you do the ISO firmware update before you began to put in e85 and did you have the flex fuel wires installed? How much e85 did you put in the tank?
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2011 BMW 335i M Sport- Space Grey Metallic * Black Kidney Grills * Jb4 Stage 2 ISO * Injen Intake * AR 4" Downpipe * 19" VMR V710 * Michelin Pilot Super Sports 235/265 * KW V3 Coilovers * 8k Alpine Angel Eyes * Gloss Black Roof Vinyl
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