1998 BMW Z3 Roadster problems

“TL* THE CONTACT OWNS A 1998 BMW Z3M ROADSTER. THE CONTACT WAS TRAVELING 25 MPH WHEN THE REAR FRAME OF THE VEHICLE FRACTURED COMPLETELY. THE CONTACT TOWED THE VEHICLE TO THE DEALER WHERE THEY ADVISED THAT THE FRAME METAL WAS EXTREMELY WEAK AND CAUSED THE FRAME TO DROP AND THE REAR AXLE TO FRACTURE FROM THE VEHICLE. THE CONTACT WAS CONCERNED BECAUSE HE COULD HAVE BEEN INVOLVED IN A CRASH IF HE WERE TRAVELING FASTER IN THE VEHICLE. THE VEHICLE WAS NOT REPAIRED. THE CURRENT AND FAILURE MILEAGE WAS 50,000.”

“THE AIRBAG FAULT LIGHT CAME ON IN OUR 1998 BMW Z3 (WITH LESS THAN 16,000 MILES ON THE ODOMETER), INDICATING THE AIRBAG (OR AIRBAGS) AND SEAT BELT TENSIONERS WERE NO LONGER FUNCTIONING. THE DEALER SERVICE REPRESENTATIVE SAID THIS WAS "A COMMON PROBLEM" WITH THIS MODEL AND TOLD US EXACTLY WHAT MOST LIKELY CAUSE OF THE PROBLEM PRIOR TO ANY DIAGNOSTICS'THAT THERE WAS A FAULT IN THE SEATBELT LATCH AND WIRING THAT CAUSED 'HIGH RESISTANCE'. THE COST OF REPAIRS WAS $825. A GOOGLE SEARCH SHOWS THIS SAME PROBLEM IS ESSENTIALLY UBIQUITOUS. I SEARCHED FOR 'BMW Z3 AIRBAG LIGHT ON', AND I GOT NEARLY 40,000 HITS. LOOKING RANDOMLY AT SOME OF THESE HITS, I FIND EACH CONTAINS MULTIPLE ACTUAL INSTANCES OF THIS PROBLEM OCCURRING. FOR EXAMPLE, THE FIRST RESULT RETURNED (HTTP://WWW.AUTOMOTIVEFORUMS.COM/T145936-Z3_AIRBAG_SENSORS.HTML) INDICATED AT LEAST 6 VEHICLES WITH THIS EXACT SAME PROBLEM. THUS, I WOULD ESTIMATE FROM THE GOOGLE SEARCH THAT THIS PROBLEM HAS AFFECTED 100,000+ VEHICLES JUST COUNTING THOSE POSTED ON THE INTERNET'PLUS ALL OF THOSE THAT ARE NOT POSTED ON THE INTERNET. THE BMW Z3 WAS A LOW VOLUME VEHICLE, SO IT WOULD APPEAR THIS SIGNIFICANT SAFETY DEFECT AFFECTS A VERY…”

“A LOUD CLUNKING SOUND COMING FROM REAR END WAS NOTICED. UPON INSPECTION, BY BMW DEALERSHIP IT WAS DETERMINED THE REAR SUBFRAME HOLDING REAR DIFFERENTIAL HAS SEPARATED FROM THE BODY OF THE VEHICLE (SPOT WELD FAILURE). I WAS TOLD IT IS EXTREMELY DANGEROUS TO DRIVE AND TO FIX IMMEDIATELY. UPON FURTHER RESEARCH, THIS APPEARS TO BE A VERY COMMON PROBLEM WITH THESE VEHICLES. HIGHER DISPLACEMENT MODELS ARE A HIGHER OCCURRENCE DUE TO CREATING MORE TORQUE ON THE REAR DIFFERENTIAL BRACKET. MINE IS THE M VERSION WHICH IS ALMOST A GUARANTEED FAILURE.”

“AT 86K MILES ON MY 1998 BMW Z3, THE THIN SHEET METAL BRACKET HOLDING THE REAR DIFFERENTIAL UP IN PLACE WELDED TO THE CHASSIS SPLIT IN HALF CAUSING THE REAR END TO HANG. THIS IS THE SECOND TIME IT HAS HAPPENED, ALSO AT 93,500 MILES, JUST 8 MONTHS LATER. THE CLUTCH IS STILL ORIGINAL AND THE CAR HAS NEVER BEEN ABUSED, OR RACED. I ALWAYS BABY THE CAR BECAUSE GAS IS SO EXPENSIVE, AND THIS SEEMS TO BE A PROBLEM WITH ALOT OF OTHER Z3'S THAT I HAVE SEEN ONLINE. THIS IS CLEARLY A MANUFACTURING FLAW. BMW CLAIMS THE CAR MUST HAVE HAD SOME REAR END IMPACT, EVEN THOUGH THIS IS CLEARLY NOT THE CASE. I WOULD LIKE TO SEE THEM REPLACE THIS PART WITH THICKER, OR STRONGER METAL AS IT CAN BE A VERY SERIOUS PROBLEM IF THE DIFFERENTIAL FALLS OUT AT HIGH SPEEDS. *TR”

“BOTH THE DRIVER SEAT AND PASSENGER SEAT RAILS ARE DEFECTIVE CAUSING THE SEATS TO MOVE BACK AND FORTH DURING STOPS ESPECIALLY DOWNHILL. THIS CREATES A SAFETY HAZARD FOR THE DRIVER AND AN UNCOMFORTABLE SITUATION FOR THE PASSENGER. BMW SAYS THAT IT WILL NOT PROVIDE A REPAIR AT ITS COST OR AT A REDUCED COST BECAUSE IT IS NOT COVERED BY THE EXPIRED WARRANTY. I BELIEVE THAT THIS IS A MANUFACTURE DEFECT INHERENT TO THIS VEHICLE. I HAVE FOUND IT ON OTHER Z3S THAT I TEST DROVE. IT SHOULD BE REPAIRED AT COST BY BMW. *NM”

“WHILE DRIVING, NEGATIVE CAMBER CAUSED TREAD TO WEAR DOWN ON REAR TIRES. *AK THIS CAUSED ABNORMAL WEAR ON THE REAR TIRES AND HAD A POTENTIAL OF LOSS OF CONTROL OF THE VEHICLE. *JG *JB”