Evaporative Emission System Leak / fix P0455 Evaporative Emission Control System Pressure Sensor

CODE P0455, P0456 EVAP Small Leak Troubleshoot / Diagnostics / Repair P0455 Evaporative Emission Control System Pressure Sensor Intermittent creator: Jay Gould The trouble codes P0455 and P0456 are related to the vehicle's Evaporative Emission Control System (EVAP), which is designed to prevent fuel vapors from escaping into the atmosphere. A P0455 code signifies a large leak in the EVAP system, while a P0456 indicates a small leak. It's crucial to understand the probable causes and methods of diagnosing and repairing these issues. When your vehicle's onboard diagnostic system (OBD-II) detects a leak in the EVAP system that exceeds a threshold, it triggers the P0455 trouble code. The most common reasons for this include a loose or faulty gas cap, a leak in one of the EVAP system hoses, a faulty purge or vent solenoid, or a faulty fuel tank pressure sensor.