OBD-II Code: P0455
LOW SEVERITY
Emissions
Evaporative Emission System Leak Detected (Gross Leak)
Can I Drive?
Usually short-distance only; diagnose soon
Stop driving if you notice overheating, bad misfires, loss of power, fuel smell, or flashing warning lights.
Common Causes
Loose gas cap, cracked EVAP hose, purge valve stuck open
DIY Checks
Tighten gas cap first; inspect EVAP lines visually
Mechanic Questions to Ask
Smoke machine test to locate the leak
Disclaimer: OBD code information is educational, not a professional diagnosis. The same code can have different causes depending on vehicle, mileage, maintenance history, and related codes. Always verify with a qualified mechanic.