the magnet needs to be fixed. i had a vic that had the same issue and i sent it into blast and they fixed it for free for me. just give them a call.
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you could try repairing it yourself.. im guessing its the magnet on the actual cap and not the engine.
if its just the cap you could try soaking the magnet area with nail polish remover for about 30 minutes or so as it breaks down super glue and then pull it out with another magnet. clean the hole it came out of and reglue it so its flush.