nope.. dealer said no problems with sensor.. i noticed that happened only occassionally when the temperature goes above 30c. thus, i'm not too fussed.

1 other thing i noticed is the temperature will only show a max of 45C. 2 weeks ago, when the temperature hit 47C in melb, it won't budge above 45C. my other car showed 50C (it was baking under the sun) the same day.