There are 4 owner-reported engine complaints for the 2003 Mercedes-Benz S-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
TL* THE CONTACT OWNS A 2003 MERCEDES BENZ S600. THE CONTACT STATED THAT WHILE DRIVING 55 MPH, THE DISTRIBUTION HOSE FAILED. THE VEHICLE WAS TOWED TO THE DEALER WHERE THE CONTACT INQUIRED ABOUT NHTSA CAMPAIGN ID NUMBER: 07V263000 (ENGINE AND ENGINE COOLING) BUT HIS ADVISED THAT HIS VIN WAS NOT INCLUDED IN THE RECALL. THE MANUFACTURER WAS THEN CONTACTED AND CONFIRMED THAT THE VEHICLE WAS NOT UNDER RECALL AND OFFERED NO FURTHER ASSISTANCE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 63,988.
RE: 2003 S600 [XXX] MY RELATIVELY NEW (3000 MILES) S600 HAS A PERSISTENT PROBLEM WITH THE NEW V12 ENGINE THAT HAS NOW DEVELOPED INTO A SERIOUS SAFETY RISK FOR THE DRIVER. MY CAR HAS BEEN IN SERVICE MORE THAN 4 TIMES FOR THIS PROBLEM - IT HAS BEEN ESCALATED TO THE TECH CENTER BY MY DEALER - IT HAS NOT EVER BEEN FIXED. THE SPARK PLUGS ARE REGULARLY FOULED BY MISFIRING CYLINDERS (1,2,7,8) - THE DEALER SAYS IT MAY BE A SOFTWARE PROBLEM THAT MBUSA HAS FAILED TO FIX..AND NOW - WHEN DRIVEN AT SPEED OVER RELATIVELY MODEST BUMPS - THE CAR TOTALLY DIES AND ALL POWER IS GONE...THE SRS LIGHT COMES ON FOR A MOMENT BUT ALL STEERING ON THE CAR IS GONE AND (IF YOU ARE NOT KILLED IN THE MEANTIME) YOU NEED TO STEER THE CAR MANUALLY TO THE SIDE OF THE ROAD AS IT COASTS TO A STOP. THIS IS A DEADLY DRIVING HAZARD - MBUSA IS AWARE OF THIS PROBLEM AND PERMITTING IT TO CONTINUE...YOU HAVE FAILED TO RESPOND TO MY PRIOR WRITTEN MATERIALS INCLUDING THOSE CONTAINED IN YOUR OWN SURVEYS TO ME...THE CAR IS A LEMON AND I WANT A NEW CAR OR WE WILL BEGIN SUIT AS WELL AS STATE AND FEDERAL LEMON AND FRAUD PROCEEDINGS ..WE WILL ALSO FILE A DEMAND WITH NHTSA THAT AN IMMEDIATE RECALL BE REQUIRED OF MBUSA ON ALL S6OO CARS WITH THIS ENGINE... NOTE THIS CYLINDER PROBLEM BEGAN TO APPEAR AT 700 MILES&.IN MARCH, 2003 IT HAPPENED AGAIN IN APRIL, 2003 AT 1000 MILES IT HAS CONTINUED TO OCCUR AND HAS NEVER BEEN FIXED&. IN THE MEANTIME, THE NEW PROBLEM OF THE POWER FAILING ENTIRELY HAS BEEN HAPPENING FOR ABOUT 10 DAYS [XXX] [XXX]. *AK INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR
THE ENGINE STALLED 3 TIMES. MODEL S430. *JB ON ONE OCCASION THE SPEED SUDDENLY DROPPED FROM 47-15MPH. SCC
THE GEARS BECAME STUCK, AND THE ENGINE DID NOT SHUT OFF, CONSUMER HAD TO DISCONNECT THE BATTERY TO SHUT OFF THE ENGINE.*JB
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026