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You may find help here; http://upkeep.us/OBDII/OBD2/Jaguar/piart.php?art=5064 This is supposed to be a list of the full Jaguar fault codes however, P1620 does not appear in the list http://www.engine-light-help.com/jaguar-check-engine-light.html Apparently in the X and S type there are fault codes built in to the instrument cluster, you will fns an explanation in the link below; http://www.bluejag.co.uk/S-Type%20Instrument-cluster-diagnostics.php