Under Bonnet/Hood, Security Switch Sensor. See #1 In the Second & Third Illustrations. FITS 2004-2009 XJ8, 2007-2014 XK, 2012-2019 XJ From VIN V22230-On. If your "open hood warning light" stays on, this is likely the part that needs to be replaced. C2C33902 C2D18250 C2C4646 (C2D27159)
