totally pointless but trick !
for all with keyless entry system diesels,,,,
get in car,put in card IMMEDIATELY press start (release, do not keep finger on button )DO NOT wait for heater plugs to go out ,
sit back and wait a few secs, car auto cranks engine and rumbles to life!
apologies if u already know i found out by chance.
ps do it to a cold engine that has been stood ALL night cos i know mine starts instantly if its had a run and is warm for hours and hours later