In 20to 30 km speed there was a little humming noise in the 1.4 diesel creta after 1000 kms . is it a big problem sir?

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@SVP in 20to 30 km speed there was a little humming noise in the 1.4 diesel creta after 1000 kms . is it a big problem sir?

Question asked from: http://www.carandbike.com/hyundai-cars/creta/14-base-diesel