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I have the same issue here. Replaced knock sensor and cleared codes. Ran good for a few days then it came back. Dealer found TSB which requires DME update. Performed all updates then a week later, knock sensor code returned. I'm lost at this point.
Codes 2E68 and 3100
Anyone find a solution?
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 (SOLD) E92 335i
Engine: RB//SPEC 2+ SMFW//PTF tune//AA FMIC//AP DP//BMS DCI//BMS CDV Mod//AA BOV//AE Exhaust//
Body: MTEC body w/ M3 side skirts/M3 style CF hood/LCI tails/CSL trunk lid/OSS AE/M3 F/R control arms/Stoptech Cross drilled rotors & steel braided brake lines |