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check this out: https://www.launchtech.co.uk/support/information/dtc-codes-list/ P0171 must be the fuel system rail as it says “P0171 – Fuel Trim System Lean Bank 1” I couldn’t find 171 in the official hyosung service manual, is that what the dash actually says on the bike ? Consider your injector system, throttle bodies in this matter here. I’m not sure how your mechanic checked that.
yup, don’t know why I’m getting this error code, can’t find it on my manual.