Genuine OEM Porsche Headlights Engine Protective Cap, part number 477941387. This protective cap is designed to shield the internal components of the headlight's adjustment mechanism (often referred to as the 'engine') from dust, moisture, and other environmental contaminants. Maintaining the integrity of these components is vital for the proper function and longevity of the headlights. Genuine OEM parts ensure an exact fit and durable protection.