Fuel Cap Warning Message
The ECM/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 message appears on the gauge display (A). To scroll to another message, press the select/reset button. The TIGHTEN FUEL CAP message appears each time you restart the engine until the system turns the message off.