Engine drive belt idler pulley. Genuine Jaguar
Fits :
XF [X250] V6 Diesel (2008-2015)

XJ [X351] 3.0 V6 Diesel (2010-on)
XJ [X350] 2.7 Diesel (2003-2009)

S-Type [X200] 2.7 Diesel (2004-2009)