One new factory original Jaguar brand downstream oxygen sensor, part number C2C1238 BIN 4. This fits:
Jaguar S-Type 3.0L 2003 - 2006
Jaguar S-Type 4.2L 2003 - 2006
Jaguar Super V8 4.2L 2005
Jaguar XKR 4.0L 2000 - 2002
Jaguar XKR 4.2L 2003 - 2006
Jaguar XK8 4.0L 1997 - 2002
Jaguar XK8 4.2L 2003 - 2006
Jaguar XJR 4.0L 2000 - 2003
Jaguar XJR 4.2L 2004 - 2005
Jaguar XJ8 4.0L 1999 - 2003
Jaguar XJ8 4.2L 2004 - 2005
Jaguar X-Type 2.5L 2002 - 2004
Jaguar X-Type 3.0L 2002 - 2008