Owner-reported issues — NHTSA
28 complaints filed with the National Highway Traffic Safety Administration for the W129 across model years 1991–1999. Federal public records, updated weekly.
| ELECTRICAL SYSTEM | 5 reports |
| EQUIPMENT | 4 reports |
| SERVICE BRAKES | 4 reports |
| AIR BAGS | 3 reports |
| VISIBILITY | 3 reports |
| HYDRAULIC | 3 reports |
| FUEL SYSTEM | 3 reports |
| ENGINE AND ENGINE COOLING | 2 reports |
Selected owner reports
1991 · AIR BAGS
PASSENGER AIR BAG DEPLOYED WHEN THE IGNITION KEY WAS TURNED ON. THE CAR WAS PARKED AND THE ENGINE WAS OFF. THERE WAS NO ONE IN THE PASSENGER SEAT AT THE TIME OF THE DEPLOYMENT. *TR
1993 · ELECTRICAL SYSTEM
1993 MERCEDES BENZ SL600 WIRING HARNESS FAILURE. INSULATION ON WIRING BECAME BRITTLE AND TURNED TO DUST. SHORTS IN WIRING LEAD TO TROUBLE LIGHTS COMING ON. ENGINE MISFIRES AND SHUTS OFF. ENGINE WIRING HARNESS NEEDS TO BE REPLACED. *TR
1995 · ELECTRICAL SYSTEM
ASR LIGHT CAME ON, CAME UP TO A RED LIGHT ON A HILL, STOPPED , LIGHT TURNED GREEN AND WHEN I ATTEMPTED TO ACCELERATE THE CAR HAD ALMOST NO POWER AND HAD A VERY HARD TIME GETTING THROUGH THE LIGHT. THE CAR WAS TAKEN TO THE REPAIR SHOP WHERE THEY WERE UNABLE TO DIAGNOSE THE PROBLEM. THE TESTER WAS UNABLE TO COMMUNICATE WITH THE CONTROL MODULE. I FINALLY FOUND A REPAIR SHOP THAT KNEW ABOUT THIS CAR HAVING A KNOWN PROBLEM. WHEN HE SHOWED ME THE WIRING IT HAD CRACKED BROKEN MISSING INSULATION ON THE ALL THE WIRES. HE SAID THAT SINCE THE WIRING WAS MISSING IT'S INSULATION IT WAS SHORTING OU
1999 · ENGINE AND ENGINE COOLING
MY 1999 MERCESDES BENZ ENGINE STALLED WHILE I AM DRIVING. IF I WAIT FOR A WHILE , THE ENGINE WOULD START AGAIN. AFTER READING SOME COMPLAINTS IN THE MBWORLD.ORG FORUM, I THINK THAT MY CAR HAS PROBLEM WITH THE CRANKSHAFT POSITION SENSOR (CPS). THIS PROBLEM IS VERY DANGEROUS AS MY CAR ENGINE CAN BE STALLED WHILE I AM DRIVING, ESPECIALLY ON FREEWAY. DO YOU KNOW IF THIS PROBLEM HA BEEN CONSIDERED TO BE RECALLED? THANKS. *TR
1996 · ELECTRICAL SYSTEM
1996 MERCEDES BENZ SL 600 WIRING HARNESS FAILURE AUTHORIZED DEALER REPORTS THAT THIS IS A TYPICAL FAILURE OF AN OLDER MERCEDES WITH ONLY 60,000 MILES. THIS FAILURE IS KNOW THROUGH OUT THE INDUSTRY BUT IT HAS NEVER BEEN RECOGNIZED BY MB CONSEQUENTLY NO RECALL. THE CAR RUNS SLUGGISHLY AND I HAVE BEEN WARNED THAT IT IS A FIRE HAZARD. COST OF REPAIR IS ESTIMATED AT $3100????? *JB
1997 · AIR BAGS
DURING VEHICLE COLLISION SEAT BELTS DID NOT RESTRAIN PROPERLY (BETTER HARNESS CONTROL) AND NO DEPLOYMENT OF AIR BAGS. MJS
1998 · TIRES
PURCHASED NEW MICHELIN SPORT TIRES DOT GUDL 275/35 ZR 18 ON11/3/2010 AND FOUND OUT THAT THE MANUFACTURING DATE WAS 1107. THESE TIRES WERE OVER 3 YEARS OLD AND SHOULD HAVE NOT BEEN SOLD AS NEW. THE TIRE DEALER ACCEPTED MY COMPLAINT AND REPLACED THEM WITH 0909 TIRES. THE OLD ONES WERE BEING RETURNED TO THE DISTRIBUTOR BUT I HAVE NO WAY OF KNOWING IF THEY ARE GOING TO BE RESOLD OR DESTROYED. SHOULDN'T THERE BE GUIDELINES MAKING SURE 3 YR OLD TIRES ARE DESTROYED AND NOT SOLD AS NEW? *TR
1998 · SUSPENSION
PURCHASED 1998 MERCEDES BENZ SL 600 FROM MBZ SAN FRANCISCO DEALERSHIP ON 4/22/09. IMMEDIATELY REPORTED EXCESSIVE AND DANGEROUS BOUNCING OF FRONT END. REPORTED DEFECT DEALER TOOK NO ACTION. TOOK CAR TO MBZ OF OAKLAND WHERE THEY DIAGNOSED BAD FRONT SUSPENSION PRESSURE CELLS WHICH CLEARLY EXISTED AT TIME OF SALE. OAKLAND MBZ COMPED DIAGNOSTIC. HAVE MADE SEVERAL ATTEMPTS TO HAVE SF MBZ CORRECT PROBLEM, BUT THEY WANT ME TO PAY FOR THE WORK AND HAVE IGNORED MY LETTERS. *TR
1998 · SERVICE BRAKES
THE BRAKE SYSTEM VACUUM BOOSTER DID NOT HOLD THE VACUUM AND CAUSED A HISSING NOISE WHEN THE BRAKES WERE APPLIED. THE BRAKE WARNING LIGHT NEVER ILLUMINATED TO INDICATE A PROBLEM. THE CONSUMER REQUESTED A REFUND FOR A PORTION OF THE REPAIR COST. PH *NLM
1998 · SERVICE BRAKES
1R SIGNAL WIRE HAD A BAD CONNECTION CAUSING THE PHONE NOT TO WORK, THE CHECK ENGINE LIGHT TO COME ON, LOW FUEL LIGH TO BLINK, AND THE DOOR LOCKS TO MALFUNCTION.
Source: NHTSA consumer complaint database · synced 2026-08-23