There is a rattling sound whenever you apply pressure to the gas peddle. The dealer tells me it's the heat shields on the exhaust but is sounds more like valve clatter to me. Still can't seem to get anything fixed. These cars have to many problems and the dealers at least this one don't want to be bothered. Like all dealerships they promise you the world when your looking to purchase but good luck after that. I'll never buy another Nissan.