wiper sensor?
 

Working on a long overdue list of irritating problems with my ML55,


Wiper sensor......hasn't worked in years.....where is it located and whats the story on repair/replacement?

You might try updating your profile and filling in important data like make and year of the vehicle and where you are located as Europe is not the same as US. That said on the generic ML55 it's generally found in the center of the windshield at the top. If you have had your windshield replaced and it stopped working your installer may have damaged it and it will need replacement not repair. Good luck.