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How to Find Engine S/N

IMPORTANT: Always obtain the serial number when possible. The serial number can help determine the engine model and also help determine the correct service parts and changes based on serial number breaks.

Old Format

4-6 numbers that are sequential with no breaks for production month or year.

New Format (starting 1997)

Alpha-numeric (e.g. XJ5050 or 4J5050) with breaks for production month and year.

FIRST DIGIT = PRODUCTION YEAR
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
V W Y 1 2 3 4 5 6 7 8 9
SECOND DIGIT = PRODUCTION MONTH
MONTH Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  A C E G L N Q S U W Y
  B D F H K M P R T V X Z