DTC P1457: EVAP System Leak Detected (EVAP Canister System): Notes

CAUTION: Fuel tank is designed for specific vacuum and pressure conditions. DO NOT deviate from the vacuum and pressure tests indicated in these procedures to prevent damage to EVAP components and/or fuel tank.

NOTE: Fresh fuel has higher volatility that creates greater pressure/vacuum. Optimum condition for testing EVAP control system is fresh fuel and less than a full tank of gas. If possible, to assist in leak detection, add one gallon of fresh fuel to tank just before starting test procedures, as long as it will not fill the tank.