not had chance to change any sensors today,but been over 150 miles today and it never did it,to be honest its not bad when it does it,its just that if i sell the car then i would like it to tick over perfect,but asked a mechanic who works on saxos and he said most do it and its nothing to worry about unless its that bad,and mine only does it now and again and its only a slight flicker for about a second,and if you ask me loads of saxos do this anyway as every one i have owned have done this.the joy of owning a saxo