the EGR fault is not a guess,it would do no damage or harm to remove and clean and check it is free,the very fact the fault is not constantly present and is off when you restart the engine is a common vauxhall fault,yes you can put a code reader onto it if you want and would have to go on anyway to clear the fault when repaired but give the EGR a look and see how it goes,good luck
wickham
July 2010