Replace Hyundai Sonata Evap System Components & Hyundai Sonata Evap System Vent Control Circuit Get Hyundai Sonata Evap Emission System. Maintaining the Evap system in your Hyundai Sonata is crucial for preventing fuel vapors from escaping into the atmosphere, ensuring both eco-friendliness and fuel efficiency. Regularly check for cracks or loose connections in the system and replace the charcoal canister every 60,000 miles to extend its lifespan. If your Sonata experiences difficulty starting, decreased fuel economy, or the Check Engine light turns on, it may be time to invest in a new Evap system. Choose a high-quality OEM-equivalent or aftermarket option that matches your Sonata's specifications, ensuring durability and seamless integration. Proper installation is key, so consider professional fitting to maintain optimal performance and to safeguard against future issues.