when my chain tensioner was replaced under warranty

they changed a few items. not just the tensioner

one of the things from memory was the timing chain guide. the noise is the chain hitting the guides and a new guide should keep the chain in place a bit better

perhaps look into having that replaced also. but it could be expensive so it may be cheaper to just keep replacing the tensioner every 15km or so

the dealership told me that had i done the job privately with them and not under warranty, the whole thing would've been close to $3k