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Hi Experts, When I start the car (only in cold start), there is an abnormal sound keep coming from engine bay for about 5 - 10 minutes. But when the engine gets warm, this sound disappears. It is clearly a rattling sound from the engine bay. When this sound is present, I can feel a little vibration to the interior of the car. This happens only when I start the car in the morning. When the engine is warm, this sound is not audible. Issue started 2 weeks back. No repairs were done to the car for last 12 months . What could be the reason? Car : Toyota Prius ZVW30 (mfd.year 2010) ODO Meter : 88,000 km Major Repairs : Complete steering rack and tie rods were replaced by Toyota Lanka 1 year and 2 months back due to a noise problem (at the cost of Rs. 114,000)