The timing belt is the one single maintenance item that can destroy your engine in an instance if not cared for properly. We need our timing belts to last 90k+ miles between service. A timing belt slapping around (being stretched and jerked) is an abused belt. It's a no brainer for me. Replace the abused belt. I've rolled the dice many times on Honda reliability, but I couldn't sleep at night if I just replaced a failed tensioner.Since tb is only 5000km old do I need to replace as it was slapping around due to failed tensioner?