looking at buying a leon sort of already agreed to it picking up tuesday i test drove it today and he told me that the temp sensor was gone which i know is a common fault already orderd the part £7.99 but when i first got into the car it was cold hadnt been run yet there is a beeping noise 3 or 4 times and the red light on the oil temp was flashing then it stopped is that normal or is this a fault?