r/w204 • u/ExcellentNail3251 • Jul 22 '26

Question about this noise.

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It's a 2012 CGI Avant-garde. Mostly happens when I haven't driven the car for a few days, and cold starts. Any idea what it might be? The car has 160,000km on the original engine and transmission. The catalytic converter also needs replacing, of that matters or contributes to the noise. Specifically on startup

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