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Fuel Cap Warning Message

The PCM detects a loose or missing fuel fill cap as an evaporative system leak and alerts the driver by showing a warning message in the gauge display.

The first time a leak is detected a TIGHTEN FUEL CAP (multi-information display model) (CHECK FUEL CAP (information display model)) message appears in the gauge display (A). To scroll to another message, press the select/reset button. The TIGHTEN FUEL CAP/CHECK FUEL CAP message appears each time you restart the engine until the system turns the message off. Turn the engine off, then replace or tighten the fuel fill cap until it clicks at least once.

Multi-information display model 

Fig 1: Display - TIGHTEN FUEL CAP
G06963752Courtesy of AMERICAN HONDA MOTOR CO., INC.

Gauge display model 

Fig 2: Display - CHECK FUEL CAP
G06963753Courtesy of AMERICAN HONDA MOTOR CO., INC.