NISSAN CENTRA WAS LOSING POWER FOR NO APPARENT REASON. AT 1ST THEY WERE UNABLE TO FIGURE OUT THE PROBLEM BECAUSE NOTHING SHOWED UP ON DIAGNOSTICS OR TEST DRIVES.THEY KEPT LOOKING AND RERSEARCHING AND DISCOVERED A FAULTY BRAKE SENSOR THAT IHAS BEEN DISCOVERED AS A KNOWN PROBLEM WITH THIS CAR MODEL IN WHICH THIS SENSOR SENDS FALSE INFOMATION TO THE BRAKES.THEY ALSO, THRU NO FAULT OF THEIR OWN EXPERIENCED DIFFICULTIES DUE TO THE SNOW STORMS WE WERE HAVING, BUT THEY HUNG IN THERE AND WE WERE PATIENT AND THEY REPLACED THE PART AND OUR CAR IS BACK ON THE ROAD.