 Bought my Sonata Limited 2.4 Turbo new in 2011. Initial pulling to the left was remedied by local alignment. With 36K on the odometer I noticed a foghorn-like sound emitting from under the hood whenever coming to a stop, and when the outside temperature was high. Initially, I suspected the brake system but then happened to come to a full stop, shift into neutral, and increase rpm's. Voila!!! The turbocharger. A couple of days at the local Hyundai dealer, and all was perfect. The problem has thankfully not re-occurred.