noise in Ford Fiesta

Hi, I have a 2002 diesel party and for some time now it makes me a strange noise as if it were to petar, I have been told that they are almost certainly the taits, but still worries me because of time in time the temperature light is turned on even though it is paid for little seconds, I have looked at the oil and refrigerant levels and they are all fine.

Does anyone know what can be ???

thank you

Make him an electronic diagnosis and see if you get out of defect .- It seems to me that it is something of electronic management.-