The contact owns a 2016 Mercedes-Benz CLA250. The contact stated while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer where it was diagnosed with a failed thermostat. The contact was informed that the thermostat needed to be replaced. The vehicle was not repaired. The vehicle was driven to the residence. The contact performed an inspection on the vehicle and determined there was a melted hole in the air intake valve. The contact stated that the dealer had not provided information of the condition of the melted air intake valve. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 116,000.