See also:

Engine serial number
MR20DE QR25DE The number is stamped on the engine as shown. ...

Engine coolant temperature gauge
Engine coolant temperature gauge NOTE: The ignition switch must be placed in the ON position for the gauge to give a reading. The gauge indicates the engine coolant temperature. The engine ...

New for 2010
The Frontier receives only minor changes for 2010, centered around safety improvements and greater availability of driveline features. ...