The contact owns a 2010 BMW Z4. The contact stated while driving at 45 MPH when attempting to depress the accelerator pedal the vehicle decrease speed independently. No warning lights illuminated. A dealer was contacted. The vehicle was taken to an dealer where it was diagnosed the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure, and they informed him there are no recalls. The approximate failure mileage was 161,000.

Source: NHTSA complaint ODI #11737891 · view all complaints for this vehicle at nhtsa.gov

TL* THE CONTACT OWNS A 2010 BMW Z4. WHILE DRIVING 40 MPH, THE ENGINE STALLED WITHOUT WARNING. THE VEHICLE WAS ABLE TO BE RESTARTED. THE FAILURE PERSISTED. THE CONTACT RECEIVED A RECALL NOTIFICATION FOR NHTSA CAMPAIGN NUMBER: 13V044000 (ELECTRICAL SYSTEM). THE VEHICLE WAS REPAIRED; HOWEVER, THE FAILURE RECURRED. THE VEHICLE WAS TAKEN TO THE DEALER FOR DIAGNOSTIC TESTING, BUT THE FAILURE COULD NOT BE DUPLICATED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 10,000.

Source: NHTSA complaint ODI #10730345 · view all complaints for this vehicle at nhtsa.gov

CAR IS A NEW (11 /21/09) BMW Z4 WITH LESS THAN 2,000 MILES. WHEN DRIVING IN SUBURBAN TRAFFIC AT APPROXIMATELY 45MPH, DRIVER SIGNALED FOR A RIGHT HAND TURN AT AN INTERSECTION WITHOUT A TRAFFIC LIGHT. WHEN BRAKES WERE APPLIED, THERE WAS VIRTUALLY NO STOPPING POWER. UNABLE TO SLOW FOR THE RIGHT TURN, DRIVER PROCEEDED TO THE NEXT TURN WHILE APPLYING ALL OF THE PHYSICAL PRESSURE SHE COULD MUSTER, WHICH FINALLY SLOWED THE CAR TOP THE POINT IT COULD BE TURNED AND STOPPED. IF THIS BRAKE FAILURE HAD OCCURRED WHEN THERE WAS STOPPED TRAFFIC, AN ACCIDENT WOULD HAVE CERTAINLY OCCURRED. THE PROBLEM WAS A CATASTROPHIC FAILURE OF THE POWER BRAKES HYDRAULIC BOOSTER. ADDITIONALLY, NO WARNING LIGHT EVER CAME ON BEFORE, DURING OR AFTER THE BRAKE FAILURE. THE BMW SERVICE DEPARTMENT SAID THAT THERE ARE WARNING LIGHTS FOR LOW FLUID AND LOW PADS, BUT NOT FOR BOOSTER FAILURE, WHICH IS UNBELIEVABLE. *TR

Source: NHTSA complaint ODI #10312902 · view all complaints for this vehicle at nhtsa.gov

DURING A COLD, DRIVING RAIN STORM, WITH DRIVER & 1 PASSENGER, STARTED TO DRIVE. (VERY 1ST DRIVE IN THIS CAR WITH COLD WEATHER) WHAT A SURPRISE: WINDSHIELD IMMEDIATELY FOGGED UP. TURNED ON DEFOGGER, WINDSHIELD THEN FOGGED UP 100% AS WELL AS ALL OTHER WINDOWS - AS VISIBILITY DISAPPEARED, I STOPPED THE CAR & OPENED THE WINDOWS WITH THE BLOWER ON. NO HEAT COULD BE USED. THIS PROCESS WAS REPEATED OVER THE NEXT 1 TO 1-1/2 HOURS IN ORDER TO CONTINUE DRIVING. ISSUE WAS REPORTED TO BMW MANY TIMES OVER. I HAD TO LEARN THAT DESPITE COLD AMBIENT TEMPERATURES W-W/O RAIN, SNOW, ETC. - THE A/C MUST BE TURNED ON IN ORDER TO NOT FOG THE WINDOWS. BMW: THERE'S NOTHING TO FIX, THAT'S THE WAY IT IS. THE AMBIENT AIR IS DIRECTED THROUGH A PORTION OF THE ENGINE COMPARTMENT, THIS HEATS UP THE AIR. BMW STATED THAT I MAY VOID THE WARRANTY IF I MODIFY THE SYSTEM TO CORRECT THIS PROBLEM. THIS HAS CONTINUED TO OCCUR. ON A DRIVE ON CA'S COAST HIGHWAY, WITH TEMPS IN THE LOW 50'S - ONE MUST STILL RUN THE A/C & NO HEAT. BMW ASKED: WHAT DO YOU HAVE AGAINST RUNNING THE A/C ALL THE TIME? IN ADDITION TO IMPAIRED VISIBILITY - THIS RESULTS IN CONSTANT, VERY LOW MPG WITH THE A/C ALWAYS ON. WHEN BMW PROVIDED MPG'S TO FED. AGENCIES, I BELIEVE THAT BMW'S A/C'S WERE NOT ON & THESE CARS DEMAND PREMIUM FUEL. I SPOKE WITH A NATIONALLY KNOWN, RESPECTED TESTER/ADVISERS OF MANY VEHICLES - IT WAS CONFIRMED TO ME THAT THE MPG TESTS ARE CONDUCTED WITHOUT THE A/C'S BEING TURNED ON. *TR

Source: NHTSA complaint ODI #10695276 · view all complaints for this vehicle at nhtsa.gov