The contact owns a 2016 Subaru Outback. The contact stated that there was an exhaust odor entering into the cabin of the vehicle, which was most noticeable when the heater was activated. The contact stated that while the vehicle was idling, there was an abnormally loud sound as if the exhaust was releasing in large amount of fumes. There were no warning lights illuminated. The contact stated that the failure was related to the emissions and was related to NHTSA ID Number: 10182196 (Engine and Engine Cooling, Equipment, Equipment Adaptive/Mobility). The vehicle was not diagnosed or repaired. The manufacturer was informed of the failure and confirmed that the VIN was not covered under NHTSA ID Number: 10182196 (Engine and Engine Cooling, Equipment, Equipment Adaptive/Mobility) or under warranty. The manufacturer opened a case and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was unknown.