Honda 2006 Odyssey Owner's Manual page 86

Multi-Information Display
Remove Key
If you leave the key in the ignition
switch in the LOCK (0) or
ACCESSORY (I) position and open
the driver's door, you will see
''REMOVE KEY'' in the display and
hear a reminder beeper.
82
Tighten Fuel Cap
If the fuel fill cap is missing or not
tightened properly, you will see
''TIGHTEN FUEL CAP.'' Make sure
the fuel cap is installed and tightened
at least one click.
The TIGHTEN FUEL CAP message
should go off after tightening the
fuel cap, turning the ignition switch
off and on, then driving over 30 mph
(48 km/h) for at least 45 seconds.
Due to different driving conditions, it
may take a few driving trips to make
the message go off.
If a loose or missing fuel cap was not
the cause of the TIGHTEN FUEL
CAP message coming on, the
message will turn off and the
malfunction indicator lamp will
come on. If this happens, have your
vehicle checked by your dealer as
soon as possible.