I have a FSA Carbon crank where the thread/bolt for my pedal has become lose and wobbles.
In all fairness the crank has has 20,000KM on it. Can it be repaired, can I replace just the crank, or do I need to replace the entire crankset?
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The FSA Warranty is 2 years on cranksets.
I would still contact them to see what they recommend.They might be able to repair, recommend a company who can repair or offer you a lower-cost replacement. You didn't say which crank arm it is but they may also be able to provide a replacement for just that crank arm.
I would also stop using the crank for now for two different reasons:
I would try the warranty route first as @Carel suggested. It is possible that the movement has done enough damage that repair is not possible. I would consult a shop that specializes in Carbon Frame repair. They may be able to reaffix the threaded insert into the arm. As carbon parts are becoming more common repair of what used to unrepairable parts is also becoming more common.