It’s part of the evaporative emissions system (commonly referred to as “EVAP”) and reads pressure in the fuel system to detect evaporative leaks, such as a loose or faulty gas cap.

When the car's onboard diagnostics (OBD ... which causes damage that triggers the Check Engine light. The EVAP system is made up of valves, rubber hoses, and a canister. Any issues with these ...

P1456 - EVAP Control System Leakage (EVAP Fuel Tank System) If your engine light illuminates and your car fails an emissions test, it could be experiencing an evaporative emission control system leak.