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Hi,
I drive a 2006 Volkswagen Golf 1.9 TDI with around 220,000 km.

Recently, I noticed two issues:

1. A blowing or whistling sound when accelerating and decelerating, which seems to come from underneath the car, possibly around the exhaust line or turbo.
2. A metallic rattling or ticking noise, especially noticeable at low RPMs.
Both noises are more noticeable when the engine is cold, but sometimes persist when hot. I haven’t experienced any significant power loss, and nothing shows up on the diagnostic scan (OBD/valise).
Could this be due to a leak in the exhaust system, a loose or damaged hose, turbo issues, or maybe injectors or valve lifters?

Thanks in advance for your help or similar experiences!

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