Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2012 Navigator – Strangest sounds I ever heard – Siren › 2012 Navigator – Strangest sounds I ever heard – Siren January 24, 2020 at 7:11 pm #895911 BillyParticipant Is it an EcoBoost? Sounds like a bad turbocharger.