Discover Buick Regal Purge Valve Replacement Cost. Locate Buick Regal Canister Purge Valve Solenoid & Buick Regal Vapor Canister Purge Solenoid. Maintaining the vapor canister purge solenoid in your Buick Regal is crucial for preventing fuel vapor leaks and ensuring optimal performance. Regularly inspecting the solenoid for cracks or damage and replacing the unit if your car experiences rough idling or trouble starting can extend its lifespan. When selecting a replacement, it's important to choose a high-quality OEM or equivalent aftermarket solenoid that matches your Regal's specifications. Look for durable materials and ensure proper installation by following the manufacturer's guidelines. By investing in the right solenoid and maintaining it diligently, you'll keep your Regal running smoothly and efficiently.