tasinga

I have a 2015 MB C300 with about 80K miles. Recently, it started making two short popping sounds (like pulling your finger out of your mouth and making a popping sound) on cold startup. After it's warmed up after a couple of minutes there's nothing and the car runs and drives normally. No other issues - it's a great running car. Any ideas what this could be? Thanks for any help. I've attached a video with the popping sound.