Subaru Forester Engine Problems

THE rotten-egg smell is sulphur dioxide, usually a sign your catalytic converter has failed. If that's what you smell take it back to the dealer and pursue a resolution with him. A malfunctioning converter should be picked up by a diagnostic check by the mechanic, but may have been missed. If the smell is always present when you get out of the car, take the car back to the dealer and go for a drive with the service manager or mechanic to show him what you are concerned about.