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Third drive cycle

During the third drive cycle after a cold start, if the fuel fill cap is still loose or missing, the PCM stores DTC P0457 "Evaporative Emission (EVAP) System Leak Detected/Fuel Cap Loose or Missing". The malfunction indicator lamp (MIL) (A) comes on, and the "CHECK FUEL CAP" message goes off.

Fig 1: Identifying Malfunction Indicator Lamp

Courtesy of AMERICAN HONDA MOTOR CO., INC.